Abstract: An apparatus for adjusting the fastening position of fastening means in a seat belt device includes a seat-portion body (7) provided with a belt guide (120) and a retaining spring (119). Ordinarily, the belt guide (120) is set in a non-use position at which the belt guide is engaged and retained by the retaining spring (119). When in use, the belt guide (120) is detached from the retaining spring (119), projected to the left and turned to insert projecting portions (120c), (120d) thereof into respective grooves (23), (24). As a result, the belt guide (120) assumes a state in which the guide portion (120a) is projected outwardly of the seat portion. When the guide portion (120a) is made to guide the vehicle seat belt (131), the portion at which a tongue (123) and buckle (124) are fastened together is offset from the corner of the protective seat (1), as a result of which the engagement between the tongue (123) and buckle (124) of the seat belt (131) is made more reliable.

Abstract: An infant-restraining protective seat (1) includes a seat portion (2) for seating an infant, a seat back (3) for supporting the back of the seated infant, and an infant seat belt device (5). The seat back (3) is tiltably attached to the seat portion (2) via a turning shaft (20) and the seat portion (2) and seat back (3) are foldable. Accordingly, when the infant-restraining protective seat (1) is not in use, the protective seat is folded up to reduce its size and can then be stored. The seat (1) can be carried about and set up on a vehicle seat much more easily. In addition, only a small amount of space is necessary for storage.

Abstract: In an infant-restraining protective seat, a cover seat (98) is tiltably supported on a turning shaft (20) which tiltably supports a seat back (3) on a seat portion (2). When the cover seat (98) is at a position at which it closes a second recess of a seat-portion body (7), the cover seat (98) forms a seat surface on the upper side of the seat-portion body (7). When the cover seat (98) is at a position at which it opens the second recess (14), the operation for fastening and unfastening a tongue (123) and buckle (124) of a seat belt device installed in a vehicle seat, which operation is performed in the second recess (14), can be performed with ease from above the front of the protective seat (1).