A connector support structure includes: a connector fitted to a counterpart connector formed in an electric component; a connector support portion formed in a wiring board in which an electric wire to be connected to the connector is arranged; and a resin adaptor which holds the connector internally and which is inserted into and supported by the connector support portion. The adaptor includes a plurality of elastic pieces in an outer circumferential surface of the adapter such that the connector is supported on an inner surface of the connector support portion through the elastic pieces.