A connector in which terminal extraction work using an extraction jig can surely be done when necessary and also at the normal time, a terminal of the other connector can be connected to a terminal of the inside of a terminal receiving chamber without any mistakes and fear of a poor fit can be removed is provided. In the connector having two connector housings 20, 10 attached with the connector housings stacked mutually, a connector front wall 17 with which the front ends of terminal receiving chambers 21 of the first connector housing 20 are covered is formed integrally to the second connector housing 10, and a terminal insertion opening 18 opened in the connector front wall 17 is provided so as to deviate from the front of a first terminal 70 and be positioned in the front of a first lance 22 for locking the first terminal when both the connector housings are held in a temporary locking position.