Fixing device and image forming apparatus

A fixing device (9) includes a pressing rotating body (9b), a heating rotating belt (9a), an induction coil (71), a magnetic core portion (72), and a belt guide member (91). The belt guide member (91) is disposed on the inner side of the heating rotating belt (9a) and includes a coil side section (94) that is disposed toward the induction coil (71) relative to a rotational axis (J1) of the heating rotating belt (9a) and includes a temperature-rise corresponding portion (941a,942a or 943a) and a non temperature-rise corresponding portion (941d, 942d or 943d), and a nip side section (95) that is disposed toward the pressing rotating body (9b) relative to the rotational axis (J1) and includes a paper-passing corresponding portion (951a, 952a or 953a) and a heat transfer portion (951d, 952d, 953d, 954 or 955) disposed on the outer side of the paper-passing corresponding portion (951a, 952a or 953a) and having thermal conductivity higher than the thermal conductivity of the paper-passing corresponding portion (951a, 952a and 953a).