An amplifier circuit has: a first amplifier circuit, including a chopper circuit amplifying a first differential signal input between first and second input terminals to output a second differential signal; and a second amplifier circuit amplifying the second differential signal to output a single-ended signal. The second amplifier circuit includes: a first circuit including first and second transistors, the first circuit being connected to the first amplifier circuit so that the second differential signal input into gates of these transistors, the first circuit converting the second differential signal to a current flowing into a first node connected to the first transistor and a current flowing into a second node connected to the second transistor; and a second circuit negatively feeding back a voltage at the second node so that the difference in voltage between these nodes is reduced. The second amplifier circuit outputs the single-ended signal from the first node.