A hot melt block 20 that is assembled at a portion where an insulating sheath 16 of a cable 10 in which a plurality of electric wires 11 and 12 are collectively surrounded by the insulating sheath 16 is removed and the electric wires 11 and 12 are drawn out, and that is melted through heating. The hot melt block 20 includes: an insertion portion 21 that can be inserted between the electric wires 11 and 12 surrounded by the sheath 16; and a spacer 24 that is fixed to the insertion portion 21, and is disposed between the electric wires 11 and 12 at the portion where the electric wires are drawn out.