In a tongue storage device according to the present invention, a pickup portion (4c) is picked up and an anchor tongue (5) is then rotated, which causes the anchor tongue (5) to abut on an occupant restraint tongue (6). The tongue (6) is then rotated together with the tongue (5) clockwise with a pivot rib (12f) as a pivot. The rotation of the two tongues (5), (6) is stopped when the tongue (6) abuts on a tongue support portion (12h). Under this condition, a lock tab (5a) of the tongue (5) is inserted through a tongue insertion hole (12g) and locked in tongue lock-and-hold means (13), thereby storing the tongue (5). At this time, the other tongue (6) is stored by being clamped between a seat belt (4) and the pivot rib (12f), and between the tongue (5) and the tongue support portion (12h). A single action for storing the tongue (5) allows both tongues (5), (6) to be stored.