Fixing device and image forming apparatus

A fixing device includes a hollow rotating body, a sheet-shaped heater that is disposed inside the rotating body in such a manner as to extend in a width direction perpendicular to a transport direction of a recording medium, which is transported along with rotation of the rotating body, and that heats the rotating body, and multiple thermal-conductive members that are arranged in such a manner as to be in contact with a surface of the sheet-shaped heater, the surface being opposite to a contact surface of the sheet-shaped heater that is in contact with the rotating body, with a gap formed between the multiple thermal-conductive members in at least one of the width direction and the transport direction and that conduct heat of the sheet-shaped heater in the width direction, the multiple thermal-conductive members being arranged such that a first thermal-conductive member and a second thermal-conductive member that are included in the multiple thermal-conductive members and that are adjacent to each other partially overlap each other when the thermal-conductive members in a state of being arranged in a plane are viewed in the transport direction.