Disclosed is a twin pump. The twin pump comprises a casing having an inlet port and an outlet port which are defined at center portions of lower and upper surfaces thereof and a pair of cylinders which are defined in a manner such that they are communicated with each other; a piston disposed in the pair of cylinders and formed, at both ends thereof, with a pair of head sections, each head section being formed with close-contact sections each having a rounded convex portion and a rounded concave portion, a circumferential inner surface of each cylinder being formed in a manner such that a circumferential outer surface of each head section can be brought into close contact therewith while being moved thereon, the casing being formed, between the pair of cylinders and the inlet port and the outlet port, with semi-circular seating parts so that close-contact sections of the piston can be brought into close contact with the semi-circular seating parts; and a pair of eccentric cams fitted through center portions of the pair of head sections and rotated in directions opposite to each other via camshafts by means of driving means, a distance between centers of the camshafts being equal to a distance between centers of the eccentric cams which are fitted through the head sections of the piston.
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