diff --git a/lib/doc/ja/Customization.lyx b/lib/doc/ja/Customization.lyx
index dac9c23118..65cf08537c 100644
--- a/lib/doc/ja/Customization.lyx
+++ b/lib/doc/ja/Customization.lyx
@@ -91,7 +91,7 @@ End
 \fontencoding auto
 \font_roman "lmodern" "IPAexMincho"
 \font_sans "default" "IPAexGothic"
-\font_typewriter "default" "default"
+\font_typewriter "default" "IPAGothic"
 \font_math "auto" "auto"
 \font_default_family default
 \use_non_tex_fonts false
diff --git a/lib/doc/ja/EmbeddedObjects.lyx b/lib/doc/ja/EmbeddedObjects.lyx
index 39683dda5d..2962e991c8 100644
--- a/lib/doc/ja/EmbeddedObjects.lyx
+++ b/lib/doc/ja/EmbeddedObjects.lyx
@@ -185,7 +185,7 @@ ruby
 \fontencoding auto
 \font_roman "lmodern" "IPAexMincho"
 \font_sans "default" "IPAexGothic"
-\font_typewriter "default" "default"
+\font_typewriter "default" "IPAGothic"
 \font_math "auto" "auto"
 \font_default_family default
 \use_non_tex_fonts false
diff --git a/lib/doc/ja/Intro.lyx b/lib/doc/ja/Intro.lyx
index 7ec4dd8b60..dea42dba5d 100644
--- a/lib/doc/ja/Intro.lyx
+++ b/lib/doc/ja/Intro.lyx
@@ -66,7 +66,7 @@ End
 \fontencoding auto
 \font_roman "lmodern" "IPAexMincho"
 \font_sans "default" "IPAexGothic"
-\font_typewriter "default" "default"
+\font_typewriter "default" "IPAGothic"
 \font_math "auto" "auto"
 \font_default_family default
 \use_non_tex_fonts false