In an electrical connector, in a state in which an abutting portion of a support is abutted against a receiving face of a retainer or an inflator housing, if the connector housing is pressed toward the mating side and then released before being inserted into the retainer to a predetermined depth, then the connector housing is pressed back in the counter mating direction due to restoring force generated in the support. If the connector housing is pressed toward the mating side and inserted into the retainer to the predetermined depth, the abutting portion becomes displaced in the abutment cancelation direction so as to separate from the receiving face, and thus the connector housing is inserted into the retainer to the predetermined depth or more so as to be mated to the retainer, and electrical terminals become connected to squib terminals. Also, a squib connection device includes this electrical connector.