A fixing apparatus comprising: at least, a heating element for heating a first rotary member; an electric power supplying portion for supplying an electric power to said heating element; at least one or more temperature detecting means (18, 19); said first rotary member shifted together with a recording material; a second rotary member for cooperating with the first rotary member to define an abutment portion therebetween; and a temperature control means for controlling a temperature of said first rotary member by performing feedback control of the electric power supplied from said electric power supplying portion to said heating element on the basis of a temperature detected by said temperature detecting means (18, 19), wherein the recording material bearing an image is nippable and conveyable at said abutment portion thereby to heat the recording material at said abutment portion; characterized in that said temperature detecting means (18, 19) is configured to detect the temperature of the first rotary member based on which the feedback control is performed and to detect a temperature change caused when the recording material rushes into said abutment portion, the temperature control means is configured to perform a start-up temperature control of the heating element to thereby temperature-control the first rotary member to a predetermined temperature, when the temperature control means performs the start-up temperature control of the heating element and the first rotary member approaches the predetermined temperature, the temperature control means finishes the start-up temperature control and sets a target temperature, when the target temperature is set, the temperature control means starts and performs the feedback control on the basis of the detected temperature of the first rotary member to achieve the target temperature until a timing before the recording material rushes into the abutment portion, when the timing before the recording material rushes into the abutment portion is reached, the temperature control means stops the feedback control and outputs a predetermined electric power supplied from said electric power supplying portion to said heating element, and the temperature control means continues to apply the predetermined electric power supplied from said electric power supplying portion to said heating element continuously until a timing after the recording material rushes into the abutment portion, wherein the predetermined electric power is set for reducing the temperature change of the first rotary member caused when the recording material rushes into said abutment portion, and when the timing after the recording material rushes into the abutment portion is reached, the temperature control means sets the target temperature and starts again the feedback control. a heating element for heating a first rotary member; an electric power supplying portion for supplying an electric power to said heating element; at least one or more temperature detecting means (18, 19); said first rotary member shifted together with a recording material; a second rotary member for cooperating with the first rotary member to define an abutment portion therebetween; and a temperature control means for controlling a temperature of said first rotary member by performing feedback control of the electric power supplied from said electric power supplying portion to said heating element on the basis of a temperature detected by said temperature detecting means (18, 19), wherein the recording material bearing an image is nippable and conveyable at said abutment portion thereby to heat the recording material at said abutment portion; characterized in that said temperature detecting means (18, 19) is configured to detect the temperature of the first rotary member based on which the feedback control is performed and to detect a temperature change caused when the recording material rushes into said abutment portion, the temperature control means is configured to perform a start-up temperature control of the heating element to thereby temperature-control the first rotary member to a predetermined temperature, when the temperature control means performs the start-up temperature control of the heating element and the first rotary member approaches the predetermined temperature, the temperature control means finishes the start-up temperature control and sets a target temperature, when the target temperature is set, the temperature control means starts and performs the feedback control on the basis of the detected temperature of the first rotary member to achieve the target temperature until a timing before the recording material rushes into the abutment portion, when the timing before the recording material rushes into the abutment portion is reached, the temperature control means stops the feedback control and outputs a predetermined electric power supplied from said electric power supplying portion to said heating element, and the temperature control means continues to apply the predetermined electric power supplied from said electric power supplying portion to said heating element continuously until a timing after the recording material rushes into the abutment portion, wherein the predetermined electric power is set for reducing the temperature change of the first rotary member caused when the recording material rushes into said abutment portion, and when the timing after the recording material rushes into the abutment portion is reached, the temperature control means sets the target temperature and starts again the feedback control.