as a tongue used in the seatbelt system, the belt insertion hole for inserting through the seat belt 3 23 to the tongue main body 25 having the seat belt system can be inserted into the buckle and having a locking ball in (27a) that can be engaged with a locking piece having a portion inserted into the buckle 27 provided to project, and the insertion portion 27 a plurality of projections 29 are formed on the surface of or in the surface of the uneven surface of the insertion portion 27 includes a plurality of recesses, the tongue having a back surface of the a convex portion having a convex portion 29 or the concave surface portion (29) or is formed in correspondence to the recess, the size or depth of the concave portion from the reference position at the reference position of the convex portion 29 is an O The .01~O.1O.
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