A superheated steam generator comprising: a steam generating part configured to generate steam from water using an induction heating means or an electric heating means; a superheated steam generating part that is supplied with the steam generated by the steam generating part, and that is configured to generate superheated steam from the steam using the induction heating means or the electric heating means; a first temperature sensor configured to measure a temperature of the steam generating part; a second temperature sensor configured to measure a temperature of the superheated steam generating part; a third temperature sensor that is provided in a fluid lead-out port of the superheated steam generating part or in the vicinity of the fluid lead-out port and configured to measure the temperature of the superheated steam; and a switching mechanism (30, 40) that is provided between the steam generating part and the superheated steam generating part, and that is configured to switch between supplying steam and stopping the supply of steam to the superheated steam generating part,wherein the switching mechanism (30, 40) is configured to switch between a waiting state that is a state where the steam generating part generates the steam and the supply of the steam is stopped, and a supply state where the steam is supplied to the superheated steam generating part, the switching mechanism (30,40) comprises a pressure regulating valve and an on/off valve, the superheated steam generator further comprises a first heating temperature control part adapted to control a first heating temperature that is a heating temperature of the steam generating part based on a measured value from the first temperature sensor: a second heating temperature control part adapted to control a second heating temperature that is a heating temperature of the superheated steam generating part based on a measured value from the second temperature sensor to a higher temperature than the first heating temperature in the waiting state, and control the second heating temperature based on a measured value from the third temperature sensor; and an on/off valve control part adapted to gradually open the on/off valve from a closed state to a predetermined valve opening degree, when the switching mechanism(30,40) switches from the waiting state to the supply state. a steam generating part configured to generate steam from water using an induction heating means or an electric heating means; a superheated steam generating part that is supplied with the steam generated by the steam generating part, and that is configured to generate superheated steam from the steam using the induction heating means or the electric heating means; a first temperature sensor configured to measure a temperature of the steam generating part; a second temperature sensor configured to measure a temperature of the superheated steam generating part; a third temperature sensor that is provided in a fluid lead-out port of the superheated steam generating part or in the vicinity of the fluid lead-out port and configured to measure the temperature of the superheated steam; and a switching mechanism (30, 40) that is provided between the steam generating part and the superheated steam generating part, and that is configured to switch between supplying steam and stopping the supply of steam to the superheated steam generating part,wherein the switching mechanism (30, 40) is configured to switch between a waiting state that is a state where the steam generating part generates the steam and the supply of the steam is stopped, and a supply state where the steam is supplied to the superheated steam generating part, the switching mechanism (30,40) comprises a pressure regulating valve and an on/off valve, the superheated steam generator further comprises a first heating temperature control part adapted to control a first heating temperature that is a heating temperature of the steam generating part based on a measured value from the first temperature sensor: a second heating temperature control part adapted to control a second heating temperature that is a heating temperature of the superheated steam generating part based on a measured value from the second temperature sensor to a higher temperature than the first heating temperature in the waiting state, and control the second heating temperature based on a measured value from the third temperature sensor; and an on/off valve control part adapted to gradually open the on/off valve from a closed state to a predetermined valve opening degree, when the switching mechanism(30,40) switches from the waiting state to the supply state.