diff --git a/compiler/erg_common/python_util.rs b/compiler/erg_common/python_util.rs
index ada53809..9ec7a385 100644
--- a/compiler/erg_common/python_util.rs
+++ b/compiler/erg_common/python_util.rs
@@ -6,7 +6,8 @@ use std::process::Command;
 use crate::serialize::get_magic_num_from_bytes;
 
 #[cfg(unix)]
-pub const BUILTIN_PYTHON_MODS: [&str; 23] = [
+pub const BUILTIN_PYTHON_MODS: [&str; 24] = [
+    "argparse",
     "copy",
     "datetime",
     "glob",
@@ -32,7 +33,8 @@ pub const BUILTIN_PYTHON_MODS: [&str; 23] = [
     "zipfile",
 ];
 #[cfg(not(unix))]
-pub const BUILTIN_PYTHON_MODS: [&str; 22] = [
+pub const BUILTIN_PYTHON_MODS: [&str; 23] = [
+    "argparse",
     "copy",
     "datetime",
     "glob",
diff --git a/compiler/erg_compiler/lib/pystd/argparse.d.er b/compiler/erg_compiler/lib/pystd/argparse.d.er
new file mode 100644
index 00000000..6b0737e8
--- /dev/null
+++ b/compiler/erg_compiler/lib/pystd/argparse.d.er
@@ -0,0 +1,14 @@
+._StoreAction: ClassType
+
+.ArgumentParser!: ClassType
+.new = 'ArgumentParser': (description := Str, prog := Str) -> .ArgumentParser!
+.ArgumentParser!.add_argument!: (
+    name: Str, # TODO: var-args
+    action := Str or NoneType,
+    default := Obj or NoneType,
+    type := Type,
+    required := Bool,
+    help := Str or NoneType,
+    choices := Obj or NoneType,
+) => ._StoreAction
+.ArgumentParser!.parse_args!: (args := Str or [Str; _] or NoneType,) => Obj # TODO: type with dependent types