A clip engages an assist grip with an engaging portion of the clip engaged with
a clip insertion hole of an attachment part. The assist grip is mounted to a body
panel by engaging a first locking pawl of the clip with a rear surface of the body
panel, and engaging a second locking pawl of the clip with a front surface of the
body panel. A pressure plug is fitted into a rear end gap portion of the clip when
a cap on the attachment part is closed.