A vehicle seat including a seat cushion and a seat back, comprising: a first heater which heats a first region of the seat cushion and the seat back; a second heater which heats a second region of the seat cushion and the seat back, the second region being different from the first region; and a controller connected to the first heater and the second heater; wherein the controller is capable of executing PWM control under which current applied to the first heater and the second heater is regulated by setting current-application timeframes within a unit time period (Tu), wherein a first current-application timeframe that is a period within the unit time period (Tu) in which current is applied to the first heater and a second current-application timeframe that is a period within the unit time period (Tu) in which current is applied to the second heater, as set under the PWM control, are shifted relative to each other when current is applied to the first heater and the second heater, and wherein a start time and an end time of the first current-application timeframe and a start time and an end time of the second current-application timeframe are each set such that the first current-application timeframe and the second current-application timeframe do not overlap, wherein at least one of the seat cushion and the seat back comprises a seat surface portion (S11, S21) arranged in a laterally central position and projecting portions (S12, S22) arranged on left and right sides of the seat surface portion (S11, S21), the projecting portions (S12, S22) projecting toward an occupant side to support sides of an occupant, wherein the first region consists of the seat surface portion (S11, S21) and the second region consists of the projecting portions (S12, S22), wherein an electric power upper limit for the first heater is set to be larger than an electric power upper limit for the second heater, wherein a thermostat is connected to the first heater and the second heater, current through the first heater and current through the second heater are applied to the thermostat alternately, wherein the thermostat comprises a current-application interrupting portion and a heating resistor, and is arranged at a section where the seat cushion and the seat back contact each other, wherein the current-application interrupting portion is made of bimetal and is configured to connect the first heater and the second heater to the ground under normal conditions, and to disconnect the first heater and the second heater from the ground when a temperature of the current-application interrupting portion reaches or exceeds a predetermined temperature, and wherein the heating resistor is configured to produce an amount of heat that corresponds to a magnitude of current input to the thermostat, and to heat the current-application interrupting portion. a first heater which heats a first region of the seat cushion and the seat back; a second heater which heats a second region of the seat cushion and the seat back, the second region being different from the first region; and a controller connected to the first heater and the second heater; wherein the controller is capable of executing PWM control under which current applied to the first heater and the second heater is regulated by setting current-application timeframes within a unit time period (Tu), wherein a first current-application timeframe that is a period within the unit time period (Tu) in which current is applied to the first heater and a second current-application timeframe that is a period within the unit time period (Tu) in which current is applied to the second heater, as set under the PWM control, are shifted relative to each other when current is applied to the first heater and the second heater, and wherein a start time and an end time of the first current-application timeframe and a start time and an end time of the second current-application timeframe are each set such that the first current-application timeframe and the second current-application timeframe do not overlap, wherein at least one of the seat cushion and the seat back comprises a seat surface portion (S11, S21) arranged in a laterally central position and projecting portions (S12, S22) arranged on left and right sides of the seat surface portion (S11, S21), the projecting portions (S12, S22) projecting toward an occupant side to support sides of an occupant, wherein the first region consists of the seat surface portion (S11, S21) and the second region consists of the projecting portions (S12, S22), wherein an electric power upper limit for the first heater is set to be larger than an electric power upper limit for the second heater, wherein a thermostat is connected to the first heater and the second heater, current through the first heater and current through the second heater are applied to the thermostat alternately, wherein the thermostat comprises a current-application interrupting portion and a heating resistor, and is arranged at a section where the seat cushion and the seat back contact each other, wherein the current-application interrupting portion is made of bimetal and is configured to connect the first heater and the second heater to the ground under normal conditions, and to disconnect the first heater and the second heater from the ground when a temperature of the current-application interrupting portion reaches or exceeds a predetermined temperature, and wherein the heating resistor is configured to produce an amount of heat that corresponds to a magnitude of current input to the thermostat, and to heat the current-application interrupting portion.