Abstract: The electrical connection box is provided with a movable cover, a fixed cover and a main body housed in the movable cover and the fixed cover. The main body is provided with a maintenance face for the attachment of a wiring and an electrical component and is detachably attached to the movable cover. The movable cover covers the main body so that the maintenance face thereof is exposed. The movable cover slides sideways into the fixed cover and is detachably attached to the fixed cover. The fixed cover covers the maintenance face.

Abstract: A grommet (10) has a small diameter drum portion (11), a large diameter drum portion (15) and a lip portion (19). A fitting groove (15d) which is fitted into a through hole of a panel is provided on an outer wall surface (15a). The lip portion (19) protrudes to an outer side of the outer wall surface (15a) of the large diameter drum portion (15) so as to contact closely with the panel (9). In the grommet (10), a rear surface side of the large diameter drum portion (15) is thin. Due to a thin-wall portion (15c) which is formed by thinning the rear surface side of the large diameter drum portion (15), upon opening a molding die (30), the lip portion (19) with a large undercut amount elastically deforms to a side of the thin-wall portion (15c). As a result, the grommet (10) can be easily released.