diff --git a/src/components/checkbox/constants/constants.ts b/src/components/checkbox/constants/constants.ts
new file mode 100644
index 0000000..a6d999c
--- /dev/null
+++ b/src/components/checkbox/constants/constants.ts
@@ -0,0 +1,20 @@
+import checkedLarge from '@/assets/icons/check/checkedLarge.svg';
+import checkedSmall from '@/assets/icons/check/checkedSmall.svg';
+import nonCheckedLarge from '@/assets/icons/check/nonCheckedLarge.svg';
+import nonCheckedSmall from '@/assets/icons/check/nonCheckedSmall.svg';
+
+export const CHECKBOX_ICON = {
+  checked: {
+    large: checkedLarge,
+    small: checkedSmall,
+  },
+  unchecked: {
+    large: nonCheckedLarge,
+    small: nonCheckedSmall,
+  },
+} as const;
+
+export const ICON_SIZE = {
+  large: 18,
+  small: 16,
+} as const;
diff --git a/src/components/toast/Toast.tsx b/src/components/toast/Toast.tsx
new file mode 100644
index 0000000..c0c67a6
--- /dev/null
+++ b/src/components/toast/Toast.tsx
@@ -0,0 +1,56 @@
+'use client';
+
+import clsx from 'clsx';
+
+import useToastLifecycle from './hooks/useToastLifecycle';
+import styles from './styles/Toast.module.css';
+import type { ToastProps } from './types/types';
+
+const DEFAULT_AUTO_DISMISS_MS = 3000;
+const DEFAULT_ANIMATION_MS = 600;
+
+export default function Toast({
+  message = '저장하지 않은 변경사항이 있어요!',
+  actionLabel = '변경사항 저장하기',
+  isOpen = true,
+  autoDismissMs = DEFAULT_AUTO_DISMISS_MS,
+  enterDurationMs = DEFAULT_ANIMATION_MS,
+  exitDurationMs = DEFAULT_ANIMATION_MS,
+  className,
+  actionClassName,
+  onAction,
+  onDismiss,
+}: ToastProps) {
+  const { isRendered, isClosing } = useToastLifecycle({
+    isOpen,
+    autoDismissMs,
+    exitDurationMs,
+    onDismiss,
+  });
+
+  return isRendered ? (
+    <div
+      className={clsx(styles.toast, isClosing ? styles.exit : styles.enter, className)}
+      role="status"
+      aria-live="polite"
+      aria-atomic="true"
+      style={{ animationDuration: `${isClosing ? exitDurationMs : enterDurationMs}ms` }}
+    >
+      <div className={styles.content}>
+        <span className={styles.icon} aria-hidden="true">
+          <svg width="20" height="20" viewBox="0 0 20 20" fill="none">
+            <circle cx="10" cy="10" r="9" stroke="white" strokeWidth="2" />
+            <line x1="10" y1="6" x2="10" y2="11" stroke="white" strokeWidth="2" />
+            <circle cx="10" cy="14" r="1.3" fill="white" />
+          </svg>
+        </span>
+        <span className={styles.message}>{message}</span>
+      </div>
+      {actionLabel ? (
+        <button type="button" className={clsx(styles.action, actionClassName)} onClick={onAction}>
+          {actionLabel}
+        </button>
+      ) : null}
+    </div>
+  ) : null;
+}
diff --git a/src/components/toast/hooks/useToastLifecycle.ts b/src/components/toast/hooks/useToastLifecycle.ts
new file mode 100644
index 0000000..a479fc2
--- /dev/null
+++ b/src/components/toast/hooks/useToastLifecycle.ts
@@ -0,0 +1,83 @@
+import { useCallback, useEffect, useRef, useState } from 'react';
+
+interface UseToastLifecycleOptions {
+  isOpen: boolean;
+  autoDismissMs: number;
+  exitDurationMs: number;
+  onDismiss?: () => void;
+}
+
+export default function useToastLifecycle({
+  isOpen,
+  autoDismissMs,
+  exitDurationMs,
+  onDismiss,
+}: UseToastLifecycleOptions) {
+  const [isRendered, setIsRendered] = useState(isOpen);
+  const [isClosing, setIsClosing] = useState(false);
+  const autoTimerRef = useRef<number | null>(null);
+  const exitTimerRef = useRef<number | null>(null);
+  const prevIsOpenRef = useRef(isOpen);
+
+  const clearTimers = useCallback(() => {
+    if (autoTimerRef.current) {
+      window.clearTimeout(autoTimerRef.current);
+      autoTimerRef.current = null;
+    }
+    if (exitTimerRef.current) {
+      window.clearTimeout(exitTimerRef.current);
+      exitTimerRef.current = null;
+    }
+  }, []);
+
+  const startDismiss = useCallback(() => {
+    if (exitTimerRef.current) return;
+    setIsClosing(true);
+    exitTimerRef.current = window.setTimeout(() => {
+      setIsRendered(false);
+      setIsClosing(false);
+      exitTimerRef.current = null;
+      onDismiss?.();
+    }, exitDurationMs);
+  }, [exitDurationMs, onDismiss]);
+
+  useEffect(() => {
+    let rafId: number | null = null;
+    const wasOpen = prevIsOpenRef.current;
+
+    if (isOpen) {
+      prevIsOpenRef.current = true;
+      const isOpening = !wasOpen;
+      if (isOpening) {
+        clearTimers();
+        rafId = window.requestAnimationFrame(() => {
+          setIsRendered(true);
+          setIsClosing(false);
+        });
+      }
+
+      if (isRendered && !isClosing && autoDismissMs > 0) {
+        clearTimers();
+        autoTimerRef.current = window.setTimeout(startDismiss, autoDismissMs);
+      }
+
+      return () => {
+        if (rafId !== null) window.cancelAnimationFrame(rafId);
+      };
+    }
+
+    if (isRendered && !isClosing) {
+      clearTimers();
+      rafId = window.requestAnimationFrame(() => startDismiss());
+    }
+    prevIsOpenRef.current = false;
+
+    return () => {
+      if (rafId !== null) window.cancelAnimationFrame(rafId);
+    };
+  }, [autoDismissMs, clearTimers, isClosing, isOpen, isRendered, startDismiss]);
+
+  useEffect(() => () => clearTimers(), [clearTimers]);
+
+  return { isRendered, isClosing };
+}
diff --git a/src/components/toast/styles/Toast.module.css b/src/components/toast/styles/Toast.module.css
new file mode 100644
index 0000000..fdcf741
--- /dev/null
+++ b/src/components/toast/styles/Toast.module.css
@@ -0,0 +1,116 @@
+.toast {
+  position: fixed;
+  top: 20px;
+  left: 20px;
+  z-index: 1000;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 10px;
+  width: 868px;
+  height: 57px;
+  padding: 12px 12px 12px 24px;
+  border-radius: 16px;
+  box-sizing: border-box;
+  background: var(--Color-Brand-Primary, #5189fa);
+  color: #ffffff;
+}
+
+.content {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  min-width: 0;
+}
+
+.icon {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 24px;
+  height: 24px;
+  flex: 0 0 auto;
+}
+
+.message {
+  font-size: 14px;
+  line-height: 1.4;
+  font-weight: 600;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.action {
+  flex: 0 0 auto;
+  border: none;
+  border-radius: 12px;
+  padding: 8px 12px;
+  background: #ffffff;
+  color: #3f6fe5;
+  font-size: 13px;
+  font-weight: 600;
+  cursor: pointer;
+}
+
+.action:focus-visible {
+  outline: 2px solid #ffffff;
+  outline-offset: 2px;
+}
+
+.enter {
+  animation: toast-pop-in 600ms ease-out;
+}
+
+.exit {
+  animation: toast-fade-out 600ms ease-in forwards;
+}
+
+@keyframes toast-pop-in {
+  0% {
+    opacity: 0;
+    transform: translateY(-8px) scale(0.96);
+  }
+  100% {
+    opacity: 1;
+    transform: translateY(0) scale(1);
+  }
+}
+
+@keyframes toast-fade-out {
+  0% {
+    opacity: 1;
+    transform: translateY(0) scale(1);
+  }
+  100% {
+    opacity: 0;
+    transform: translateY(-6px) scale(0.98);
+  }
+}
+
+@media (max-width: 768px) {
+  .toast {
+    top: 97px;
+    left: 20px;
+    width: 343px;
+    height: 49px;
+    padding: 8px 8px 8px 12px;
+    gap: 8px;
+  }
+
+  .message {
+    font-size: 13px;
+  }
+
+  .action {
+    padding: 6px 10px;
+    font-size: 12px;
+  }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .enter,
+  .exit {
+    animation: none;
+  }
+}
diff --git a/src/components/toast/types/types.ts b/src/components/toast/types/types.ts
new file mode 100644
index 0000000..bfe1bad
--- /dev/null
+++ b/src/components/toast/types/types.ts
@@ -0,0 +1,14 @@
+import type { ReactNode } from 'react';
+
+export interface ToastProps {
+  message?: ReactNode;
+  actionLabel?: ReactNode;
+  isOpen?: boolean;
+  autoDismissMs?: number;
+  enterDurationMs?: number;
+  exitDurationMs?: number;
+  className?: string;
+  actionClassName?: string;
+  onAction?: () => void;
+  onDismiss?: () => void;
+}