Tube connecting connector

In order to provide a low-cost, easy to use tube-connecting connector, the connector (1) is configured from an elastic member, and the inner diameter of a pathway (3) is set in a manner so as to be smaller than the other diameter of a tube (4a, 4b). Consequently, if there is an attempt to insert the tube (4a, 4b) into the pathway (3), the tip of the tube (4a, 4b) accordingly proceeds within the pathway while expanding the pathway (3). By means of the present configuration, it is possible to produce the connector (1) in a simple manner, and so high precision is not required, nor are many components required. Also, by means of the present invention, it is possible to connect tubes (4a, 4b) having diverse outer diameters. As a result, it is possible to provide a low-cost, easy to use connector (1).