A thermal energy treatment apparatus includes: an insulating substrate having a longitudinal axis a heating element provided on the insulating substrate, the heating element including a heater configured to generate heat by energization, a resistance value of the heater having per unit length in a direction of the longitudinal axis being a first resistance value, and a connector configured to be conducted to the heater, a resistance value of the connector per unit length in the direction of the longitudinal axis being a second resistance value smaller than the first resistance value and a controller configured to determine a state of the connector based on an index value of a temperature of the connector, and restrict an output value of energization of the heater based on the determined state of the connecting unit.
