To provide a multiple pump having three or more systems of oil pressure sources respectively having different discharge amounts in one small and compact cylinder block without impairing of sucking performance in its piston pump.

This multiple pump comprises a piston pump having plural systems of oil pressure sources. The plural systems of oil pressure sources are constructed such that a valve plate 10 is formed with two streak parallel arc-shaped discharge ports 10b, 10c respectively having different diameters, and one streak arc-shaped discharge port 10d, respectively along a rotational direction in a discharge stroke range, while these discharge ports 10b, 10c, 10d respectively communicate with discharge openings 2b, 2c, 2d.