diff --git a/decode_test.go b/decode_test.go
index 8f55290..e470e64 100644
--- a/decode_test.go
+++ b/decode_test.go
@@ -2148,7 +2148,7 @@ b: *a
 		t.Parallel()
 		yml := `
 a:
-  "b": 2
+  "b"  : 2
   'c': true
 `
 		var v struct {
diff --git a/scanner/context.go b/scanner/context.go
index c6ec568..09d0a2d 100644
--- a/scanner/context.go
+++ b/scanner/context.go
@@ -6,6 +6,8 @@ import (
 	"github.com/goccy/go-yaml/token"
 )
 
+const whitespace = ' '
+
 // Context context at scanning
 type Context struct {
 	idx                int
@@ -149,6 +151,18 @@ func (c *Context) currentChar() rune {
 	return rune(0)
 }
 
+func (c *Context) currentCharWithSkipWhitespace() rune {
+	idx := c.idx
+	for c.size > idx {
+		ch := c.src[idx]
+		if ch != whitespace {
+			return ch
+		}
+		idx++
+	}
+	return rune(0)
+}
+
 func (c *Context) nextChar() rune {
 	if c.size > c.idx+1 {
 		return c.src[c.idx+1]
diff --git a/scanner/scanner.go b/scanner/scanner.go
index c0072cb..cf58bfb 100644
--- a/scanner/scanner.go
+++ b/scanner/scanner.go
@@ -811,9 +811,9 @@ func (s *Scanner) scan(ctx *Context) (pos int) {
 				token, progress := s.scanQuote(ctx, c)
 				ctx.addToken(token)
 				pos += progress
-				// If the quote is immediately followed by ':', the quote should be treated as a map key.
+				// If the non-whitespace character immediately following the quote is ':', the quote should be treated as a map key.
 				// Therefore, do not return and continue processing as a normal map key.
-				if ctx.currentChar() == ':' {
+				if ctx.currentCharWithSkipWhitespace() == ':' {
 					continue
 				}
 				return