To provide a connector for a medical care device which promptly connects and disconnects a pair of male and female type connectors to plural fluid lines, thereby maintaining interfluid connection without causing coincident bubble leakage.

The male and female type connectors include a male type cylindrical hollow fluid pin which extends from an end of the male type connector corresponding to the number of fluid connections. An outer wall of the fluid pin has an inclined angle over a large part of its length which forms a cylindrical part. The female type connector includes an opening of a female type fluid socket corresponding to the male type fluid pin. The opening of the female type fluid socket has a surrounding opening larger than the cylindrical part of the male type fluid pin. The opening is inclined toward a narrow inner cylindrical part with a slightly less inner diameter than the outer diameter of the cylindrical part of the male type fluid pin. As a result, the compatibility with no fluid leakage due to the difference in diameters is achieved when the male type cylindrical hollow fluid pin is inserted in the female type fluid receptacle socket.