A delay circuit includes: a current control circuit which has n (n is 1 or larger natural number) control pins and a first output line, and is capable of controlling current outputted from the first output line in response to n control signals inputted to the corresponding n control pins; a current mirror circuit connected with the first output line to produce current mirror current from the current and output the current mirror current from a second output line; a first active element having a gate pin and an input pin, the gate pin is connected with the second output line, and the input pin is connected with the first voltage line; a second active element having a gate pin and an input pin, the gate pin is connected with the first output line, and the input pin is connected with the second voltage line; and an inverter circuit having third and fourth active elements connected in series between an output pin of the first active element and an output pin of the second active element.