A connector terminal checking device of the present invention comprises a base plate, a checking body movably mounted on the base plate, and a connector holder fixed onto the base plate, wherein the checking body further comprises a plurality of check pins aligned facing toward the connector holder, and the connector holder is provided with a terminal holding wall formed with a plurality of terminal position regulating sections, each for receiving a corresponding one of a plurality of terminal accommodating chambers of a connector to be checked, and also provided with a pair of connector sustainers shiftably urged by way of a resilient stuff, wherein by shifting the checking body toward the connector installed in the connector holder to bring the terminals in the connector into contact with the check pins, the terminals improperly inserted in the accommodating chamber are abutted against the terminal position regulating section and shifted to the properly inserted position.