Abstract: The present invention relates to a heater guard for circular (cylindrical) heaters provided with guarding functions also for the top surface, and it is an object thereof to prevent people from coming close thereto. The main body guard is comprised of a pair of right and left semi-cylinders 10A, 10B, there are provided connecting and fixing tools that include mounting and supporting portions that are fixed to upper half portions of the main body guard, elongated horizontal portions having a horizontal surface that are formed by bending elongated portions of the mounting and supporting portions in outer peripheral directions, and locking portions that are formed on upper surfaces of the elongated horizontal portions and that may be freely engaged with a peripheral surface upper cover portion of the upper surface guard.