Tongue and seat belt device using the same

A tongue which is slidably supported by a seat belt, divides said seat belt into a shoulder belt and a lap belt and is provided capable of being engaged with a buckle, comprising:

• an elongated belt insertion hole through which said seat belt is inserted;
• and
• a seat-belt sliding portion having a seat-belt sliding face which forms a part of said belt insertion hole and on which said seat belt slides, wherein
• said seat-belt sliding portion has a predetermined number of recess portions disposed in said seat-belt sliding face and a predetermined number of projections disposed independently of each other in a dotted state in said recess portions;
• each of said projections is provided such that sliding resistance between said seat belt and the seat-belt sliding portion is small in a normal time and the sliding resistance between said seat belt and the seat-belt sliding portion when the seat belt slides to said lap belt side in an emergency is larger than the sliding resistance between said seat belt and the seat-belt sliding portion when said seat belt slides to said shoulder belt side.