A fusible link unit comprising: a locking member comprising a first locked portion, a second locked portion, and a pair of first abutted portions; a connection section; a first body comprising a first locking part configured to lock the first locked portion, and a pair of first abutting parts each of the pair of first abutting parts configured to abut a first part provided on each of the pair of first abutted portions, and extending in a predetermined direction from a first boundary, the first boundary being a boundary of the first body with the connection section and extending in a direction that intersects a deployed direction of at least one of the pair of first abutting parts; a second body comprising a second locking part configured to lock the second locked portion, and a pair of second abutting parts each of the pair of second abutting parts configured to abut a second part provided on each of the pair of first abutted portions, and extending in the same direction as the first body from a second boundary, the second boundary being a boundary of the second body with the connection section and extending in a direction that intersects a deployed direction of at least one of the pair of second abutting parts, a bus bar, a first resin portion and a second resin portion, the bus bar has a flat strip portion, which is the connection section, a flat first fuse circuit plate section and a flat second fuse circuit plate section, the first body comprises the first resin portion and the first fuse circuit plate section and the second body comprises the second resin portion and the second fuse circuit section, characterized in that the locking member comprises a bottom wall, a pair of first side walls, and a pair of second side walls, and is formed in a rectangular open-top-box structure, the pair of first abutting parts includes a pair of first abutting surfaces each of the first abutting surfaces being configured to abut the first part arranged on an outer surface of each of the pair of first side walls, the first boundary extends in a direction orthogonal to the deployed direction of at least one of the pair of first abutting surfaces, the pair of second abutting parts includes a pair of second abutting surfaces each of the second abutting surfaces being configured to abut the second part arranged on the outer surface of each of the pair of first side walls, and the second boundary extends in parallel with the first boundary and extends in a direction orthogonal to the deployed direction of at least one of the pair of second abutting surfaces. a locking member comprising a first locked portion, a second locked portion, and a pair of first abutted portions; a connection section; a first body comprising a first locking part configured to lock the first locked portion, and a pair of first abutting parts each of the pair of first abutting parts configured to abut a first part provided on each of the pair of first abutted portions, and extending in a predetermined direction from a first boundary, the first boundary being a boundary of the first body with the connection section and extending in a direction that intersects a deployed direction of at least one of the pair of first abutting parts; a second body comprising a second locking part configured to lock the second locked portion, and a pair of second abutting parts each of the pair of second abutting parts configured to abut a second part provided on each of the pair of first abutted portions, and extending in the same direction as the first body from a second boundary, the second boundary being a boundary of the second body with the connection section and extending in a direction that intersects a deployed direction of at least one of the pair of second abutting parts, a bus bar, a first resin portion and a second resin portion, the bus bar has a flat strip portion, which is the connection section, a flat first fuse circuit plate section and a flat second fuse circuit plate section, the first body comprises the first resin portion and the first fuse circuit plate section and the second body comprises the second resin portion and the second fuse circuit section, characterized in that the locking member comprises a bottom wall, a pair of first side walls, and a pair of second side walls, and is formed in a rectangular open-top-box structure, the pair of first abutting parts includes a pair of first abutting surfaces each of the first abutting surfaces being configured to abut the first part arranged on an outer surface of each of the pair of first side walls, the first boundary extends in a direction orthogonal to the deployed direction of at least one of the pair of first abutting surfaces, the pair of second abutting parts includes a pair of second abutting surfaces each of the second abutting surfaces being configured to abut the second part arranged on the outer surface of each of the pair of first side walls, and the second boundary extends in parallel with the first boundary and extends in a direction orthogonal to the deployed direction of at least one of the pair of second abutting surfaces.