Patent ID: 8460250

Claim:
A medical container comprising: a circular tube body; a cylindrical gasket sliding in the circular tube body in an air-tight and/or liquid-tight manner; and a liquid passage formed on a tip side through the circular tube body or the gasket, wherein the gasket is composed of a gasket body member having a cylindrical outside shape, and an elastic ring member fitted on the gasket body member, the gasket body member has a fitting portion for fitting in the elastic ring member, the fitting portion having a large diameter part and a small diameter part, an inside diameter of the elastic ring member is smaller than the large diameter part in a natural state, while an outside diameter of the elastic ring member is larger than an inside diameter of the circular tube body in a state where the elastic ring member is fitting on the large diameter part, and the elastic ring member is fitted onto the small diameter part in a second state by sliding the gasket in a longitudinal axial direction from a first state in which the elastic ring member is fitted on the large diameter part inside the circular tube body, wherein the elastic ring member has an engaging portion for engagement with a boundary portion between the large diameter part and the small diameter part in the first state.