A fuse 1 includes a case member 10 that has a rectangular parallelepiped shape and has a space surrounded by a bottom portion and side walls, a lid member 20 that closes an upper opening of the case member 10 and closely adheres to the case member, a fuse-element 30 disposed in the space, and a pair of terminals 40 and 50 connected to both ends of the fuse-element 30. The case member 10 includes a plurality of engaging projections 17 formed on a side wall 12 extending in the longitudinal direction, and a plurality of engaging projections 18 formed on a side wall 13 that opposes the side wall 12. The lid member 20 includes a plurality of engagement recesses 27 formed in a contact wall 22 in contact with the side wall 12 and fitted respectively to each of the plurality of engaging projections 17, and a plurality of engagement recesses 28 formed in a contact wall 23 in contact with the side wall 13 and fitted respectively to each of the plurality of engaging projections 18.