The present application invention provides a fuse capable of saving space inside a casing even when the casing includes a plurality of fusion parts arranged side by side. A fuse includes: a fuse element including a fusion part provided between a pair of terminal portions; and a casing configured to house a part of the fuse element while causing the terminal portions to protrude outward. Two or more of the fusion parts are arranged in a lateral direction X orthogonal to a terminal portion direction Y connecting the terminal portions and connected to the terminal portions. The casing includes two casing split pieces configured to house the fuse element to sandwich the fuse element. The respective casing split pieces are fixed to each other by a frame-shaped fixing member configured to make one round of a periphery of the respective casing split pieces. A housing space N1 of the casing has a maximum width L1 in the vertical direction Z narrower than a maximum width L2 in the lateral direction X.