To provide a fixed amount spouting vessel which is capable of spouting liquid of the fixed amount by a simple operation of setting a container body A upside down, and squeezing its barrel portion 2, and conveniently handled.

The fixed amount spouting vessel includes: a vessel body A in which a neck part 4 is erected from a squeezable barrel section 2; a piston sliding cylinder C which is vertically provided from a cap B having a spout 12, which is attached to close an upper end opening of the neck part 4, and has a communication hole 24 with the inside of the vessel body; a piston D which closes upper and lower parts in the cylinder C and slides therein, and is vertically provided with a part 32 to be pressed form the lower side, and constantly urged downwardly; a plug E which is projected from an upper side of the piston while a seal part 41 at its fore end is fitted to a plug sliding cylinder 13 provided in a spout part in a liquid-tight sliding manner; a pair of shaking plates 50 which are vertically provided from the piston sliding cylinder in a shakable manner; and a pressing plate 52 which is projected from a lower part of each shaking plate, and capable of pushing up a part 32 to be pressed by the inward pressure of each shaking plate while an upper side thereof forms a sliding press-surface 51 which is gradually lowered inwardly.