To improve the insertion fit property of a trim, reduce manufacturing cost, reduce weight of parts and use materials effectively.

This insert for a trim includes frame parts 11 each placed in parallel with a predetermined interval, a bond part 12 extending to cross the frame parts 11, for joining each frame component 11, and inter-branch components 17 that are placed alternately with the frame parts 11 respectively, separated from the bond part 12 extending to cross the frame parts 11, joined to the frame part 11 adjacent thereto, and turns at a side end portion (dotted line 15) of the adjacent frame part 11 to be folded into the part 11.