PROBLEM TO BE SOLVED: To provide a structure for mounting a holder in which thinning is achieved without damaging the strength.SOLUTION: The structure 1 for mounting the holder includes: the holder 2 having a holder body 3 mounted with a fuse 11 as an electrical component, and a pair of plates 8 erected from the holder body 3 so that the fuse 11 is positioned between them; and a holder mount 5 into which the holder 2 is slidably inserted and which has a housing 22 in which a fork terminal 20 as a connection terminal connected to the fuse 11 is housed. The plates 8 include a thick wall 8A which is continuous with the holder body 3, and a thin wall 8B which is continuous with the thick wall 8A and thinner than the thick wall 8A formed at an end 81 separated from the holder body 3 of the plates 8. In the thin wall 8B, a final locking part 12 is provided which is locked to the holder 2 at a position where the holder 2 is inserted in a sliding manner into the housing 22 and the fuse 11 is connected to the fork terminal 20.