Connector having connector constituents and a locked portion

A connector comprising:

• a first connector constituent including a first terminal and a locking portion;
• a second connector constituent including a second terminal and a locked portion, and configured so that the second terminal is joined to the first terminal when the second connector constituent is installed in the first connector constituent;
• a third connector constituent including a third terminal and a locked-portion holding portion configured to keep the locked portion locked to the locking portion, and to keep the first terminal contacted to the second terminal when the third connector constituent is installed over the second connector constituent installed in the first connector constituent;
• and
• a compression coil spring,
• wherein
• the compression coil spring is provided within a first cylindrical portion of the third connector constituent and between a body portion of the third connector constituent and the second connector constituent, and
• the compression coil spring biases the second connector constituent downward.