A connector comprising: a plurality of connection terminals comprising cable connecting parts to which cables are connected; a housing holding the connection terminals; an installing part, formed by a part of the housing, and adapted to be fitted into a mounting hole of a connection counterpart; and a sealing member, provided in the installing part, and adapted to seal between the installing part and the mounting hole, wherein connecting tab parts provided in the connection terminals further comprising connecting plate parts between the cable connecting parts and the connecting tab parts are adapted to be connected to a terminal block provided at the connection counterpart side, wherein the cable connecting parts are arranged side by side at equals intervals, and the connecting tab parts are arranged side by side at equal intervals, characterized in that the connection terminals further include two positive pole connection terminals (21X, 21Y) and one negative pole connection terminal; and the cable connecting part of the positive pole connection terminal is arranged in a gap between two cable connecting parts that are connected to each other by the connecting plate part of the negative pole connection terminal which is a confluent connection terminal; and the negative pole connection terminal includes one of the connecting tab parts; and the connecting plate part of the positive pole connection terminal extends along the cable and the connecting plate part of the positive pole connection terminal extends in a direction perpendicular to the cable and the connecting plate part of the negative pole connection terminal extends in a direction perpendicular to the cable. a plurality of connection terminals comprising cable connecting parts to which cables are connected; a housing holding the connection terminals; an installing part, formed by a part of the housing, and adapted to be fitted into a mounting hole of a connection counterpart; and a sealing member, provided in the installing part, and adapted to seal between the installing part and the mounting hole, wherein connecting tab parts provided in the connection terminals further comprising connecting plate parts between the cable connecting parts and the connecting tab parts are adapted to be connected to a terminal block provided at the connection counterpart side, wherein the cable connecting parts are arranged side by side at equals intervals, and the connecting tab parts are arranged side by side at equal intervals, characterized in that the connection terminals further include two positive pole connection terminals (21X, 21Y) and one negative pole connection terminal; and the cable connecting part of the positive pole connection terminal is arranged in a gap between two cable connecting parts that are connected to each other by the connecting plate part of the negative pole connection terminal which is a confluent connection terminal; and the negative pole connection terminal includes one of the connecting tab parts; and the connecting plate part of the positive pole connection terminal extends along the cable and the connecting plate part of the positive pole connection terminal extends in a direction perpendicular to the cable and the connecting plate part of the negative pole connection terminal extends in a direction perpendicular to the cable.