A distributor (e) comprising: an outgoing-side header to which a plurality of outgoing pipes (1a-1, 1a-2, 1b) are connected; a return-side header to which a plurality of return pipes (2a-1, 2a-2, 2b) are connected; and the plurality of outgoing pipes (1a-1, 1a-2, 1b) including at least two first outgoing pipes (1a-1, 1a-2) connected to a fluid distribution side and a second outgoing pipe connected to a fluid supply side, the plurality of return pipes (2a-1, 2a-2, 2b) including at least two first return pipes (2a-1, 2a-2) connected to the fluid distribution side and a second return pipe connected to the fluid supply side, the at least two first outgoing pipes (1a-1, 1a-2) being each provided with a pump (5a, 5b), or the at least two first return pipes (2a-1, 2a-2) being each provided with a pump (5a, 5b), the outgoing-side header and the return-side header being disposed to be parallel to each other in the longitudinal direction, the second return pipe being connected at a position closer to the outgoing-side header than are the connecting positions of the at least two first return pipes (2a-1, 2a-2) to the return-side header, the second outgoing pipe being connected to the outgoing-side header between connecting positions of the at least two first outgoing pipes (1a-1, 1a-2) in the longitudinal direction of the outgoing-side header, characterized in that the second return pipe being connected to the return-side header, on a downstream side in a direction in which fluid returning from the at least two first return pipes (2a-1, 2a-2) flows, and at an opposite side, across a longitudinal direction of the return-side header, from connecting positions of the at least two first return pipes (2a-1, 2a-2) to the return-side header and the distributor further comprises a bypass pipe connecting the outgoing-side header and the return-side header wherein an inside diameter of the bypass pipe being smaller than an inside diameter of each of the at least two first outgoing pipes (1a-1, 1a-2), the second outgoing pipe, the at least two first return pipes (2a-1, 2a-2), and the second return pipe. an outgoing-side header to which a plurality of outgoing pipes (1a-1, 1a-2, 1b) are connected; a return-side header to which a plurality of return pipes (2a-1, 2a-2, 2b) are connected; and the plurality of outgoing pipes (1a-1, 1a-2, 1b) including at least two first outgoing pipes (1a-1, 1a-2) connected to a fluid distribution side and a second outgoing pipe connected to a fluid supply side, the plurality of return pipes (2a-1, 2a-2, 2b) including at least two first return pipes (2a-1, 2a-2) connected to the fluid distribution side and a second return pipe connected to the fluid supply side, the at least two first outgoing pipes (1a-1, 1a-2) being each provided with a pump (5a, 5b), or the at least two first return pipes (2a-1, 2a-2) being each provided with a pump (5a, 5b), the outgoing-side header and the return-side header being disposed to be parallel to each other in the longitudinal direction, the second return pipe being connected at a position closer to the outgoing-side header than are the connecting positions of the at least two first return pipes (2a-1, 2a-2) to the return-side header, the second outgoing pipe being connected to the outgoing-side header between connecting positions of the at least two first outgoing pipes (1a-1, 1a-2) in the longitudinal direction of the outgoing-side header, characterized in that the second return pipe being connected to the return-side header, on a downstream side in a direction in which fluid returning from the at least two first return pipes (2a-1, 2a-2) flows, and at an opposite side, across a longitudinal direction of the return-side header, from connecting positions of the at least two first return pipes (2a-1, 2a-2) to the return-side header and the distributor further comprises a bypass pipe connecting the outgoing-side header and the return-side header wherein an inside diameter of the bypass pipe being smaller than an inside diameter of each of the at least two first outgoing pipes (1a-1, 1a-2), the second outgoing pipe, the at least two first return pipes (2a-1, 2a-2), and the second return pipe.