A fuse includes a case member that has a rectangular parallelepiped shape and has a space, a lid member that closes an upper opening of the case member and closely adheres to the case member, a fuse-element disposed in the space, and a pair of terminals, whose distal ends are exposed to outside, connected to both ends of the fuse-element. The case member includes a plurality of first engaging projections formed on a first side wall, and a plurality of second engaging projections formed on a second side wall. The lid member includes a plurality of first engagement recesses formed in a first contact wall and fitted respectively to the plurality of first engaging projections, and a plurality of second engagement recesses formed in a second contact wall and fitted respectively to the plurality of second engaging projections.