Abstract: A load connection state detector circuit for use in a stereophonic system comprises: a check mode setting circuit for generating a check mode signal to perform checking; an offset generator circuit for generating an offset voltage from an input-stage amplification section according to the check mode signal; a first current detector circuit for detecting a current flowing to a first load according to the offset voltage; a second current detector circuit for detecting a current to a second load according to the offset voltage; and a difference-current detector circuit for detecting whether or not a difference current between output currents of the first and second current detector circuits falls within a predetermined range.