To provide an engine starter capable of preventing an erroneous operation.

Starting signals for an engine are outputted from a start control circuit 50 through branch lines 10-13 to plural connection lines Acc, IG1, IG2, ST and 12V interposed through connection terminals 7 and 8 between a pair of connection terminals 5 and 6 for connecting an ignition switch 1 to an engine control circuit 4, and the engine is started. At that time, relays RY6 and RY7 are interposed in the ignition connection lines IG1 and IG2 out of the plural connection lines Acc, IG1, IG2, ST and 12V on the more ignition switch 1 side than the branch lines 11 and 12, and the connection lines IG1 and IG2 are cut off by the relays RY6 and RY7.