A wire cover disclosed by this specification is for covering a plurality of wires pulled out from a housing, and includes a cover body into which the plurality of wires pulled out from the housing are introduced from front and from which the plurality of wires are drawn out in a rightward direction, and a guiding portion provided on an inner surface of the cover body and configured to guide small-diameter wires arranged to have shorter in-cover lengths, out of the plurality of wires, than a large-diameter wire on a left side arranged to have a longest in-cover length from a wire introduction position PI where the wire is introduced into the cover body to a wire draw-out position PO where the wire is drawn out from the cover body, out of the plurality of wires to an extra length accommodation space provided in the cover body.