A fixing apparatus, comprising: a heating rotating member for fixing a toner image on a sheet of paper by heating; a first detection portion for detecting a temperature of an atmosphere attained by heat conduction from said heating rotating member as a first detected temperature; a second detection portion for detecting a quantity of infrared rays radiated from said heating rotating member; a heating portion for heating said heating rotating member; and a control portion for controlling heating by said heating portion based on said first detected temperature from said first detection portion and a second detected temperature corresponding to the quantity of infrared rays from said second detection portion, characterized in that said first detection portion is provided at a position above said heating rotating member to grasp an ascending air current owing to heat convection produced in the vicinity of the heating rotating member, said second detection portion is provided at a position below said heating rotating member to avoid the ascending air current caused by said heat convection, and the fixing apparatus further comprises a storage portion for storing a value for correcting said first detected temperature and indicating relation between said first detected temperature and said second detected temperature, wherein the value stored in said storage portion includes a first value indicating relation in a first state in which said heating rotating member remains stopped, a second value indicating relation in a second state which is a state where said heating rotating member rotates without fixing a toner image on a sheet of paper by heating, and a third value indicating relation in a third state which is a state where said heating rotating member rotates while fixing a toner image on a sheet of paper by heating, and said control portion being configured to correct said first detected temperature with said second detected temperature and said first value in said first state, to correct said first detected temperature with said second detected temperature and said second value in said second state, and to correct said first detected temperature with said second detected temperature and said third value in said third state. a heating rotating member for fixing a toner image on a sheet of paper by heating; a first detection portion for detecting a temperature of an atmosphere attained by heat conduction from said heating rotating member as a first detected temperature; a second detection portion for detecting a quantity of infrared rays radiated from said heating rotating member; a heating portion for heating said heating rotating member; and a control portion for controlling heating by said heating portion based on said first detected temperature from said first detection portion and a second detected temperature corresponding to the quantity of infrared rays from said second detection portion, characterized in that said first detection portion is provided at a position above said heating rotating member to grasp an ascending air current owing to heat convection produced in the vicinity of the heating rotating member, said second detection portion is provided at a position below said heating rotating member to avoid the ascending air current caused by said heat convection, and the fixing apparatus further comprises a storage portion for storing a value for correcting said first detected temperature and indicating relation between said first detected temperature and said second detected temperature, wherein the value stored in said storage portion includes a first value indicating relation in a first state in which said heating rotating member remains stopped, a second value indicating relation in a second state which is a state where said heating rotating member rotates without fixing a toner image on a sheet of paper by heating, and a third value indicating relation in a third state which is a state where said heating rotating member rotates while fixing a toner image on a sheet of paper by heating, and a first value indicating relation in a first state in which said heating rotating member remains stopped, a second value indicating relation in a second state which is a state where said heating rotating member rotates without fixing a toner image on a sheet of paper by heating, and a third value indicating relation in a third state which is a state where said heating rotating member rotates while fixing a toner image on a sheet of paper by heating, and said control portion being configured to correct said first detected temperature with said second detected temperature and said first value in said first state, to correct said first detected temperature with said second detected temperature and said second value in said second state, and to correct said first detected temperature with said second detected temperature and said third value in said third state. correct said first detected temperature with said second detected temperature and said first value in said first state, to correct said first detected temperature with said second detected temperature and said second value in said second state, and to correct said first detected temperature with said second detected temperature and said third value in said third state.