An oscillator circuit includes (2n+1) inverters connected in series when n is a natural number, an integrator circuit having an input terminal connected to an output terminal of a (2n+1)-th inverter and an output terminal connected to an input terminal of a first inverter, first and second p-type transistors connected in series between the input terminal of the first inverter and a first reference potential, and first and second n-type transistors connected in series between the input terminal of the first inverter and a second reference potential. An output voltage of a j-th inverter is applied to control electrodes of the first p-type transistor and the first n-type transistor. An output voltage of a k-th inverter is applied to control-electrodes of the second p-type transistor and the second n-type transistor. Symbol j is an odd number, k is an even number, and j