A fixing device comprising: an endless belt rotatable in a predetermined direction of rotation; a nip formation assembly disposed opposite an inner circumferential surface of the endless belt ; an opposed rotary body pressed against the nip formation assembly in a pressurization direction via the endless belt to form a fixing nip (N) between the endless belt and the opposed rotary body through which a recording medium bearing a toner image is conveyed; a heater ; a reflector ; and a support contacting and supporting the nip formation assembly , the support including: a base contacting the nip formation assembly ; an upstream projection (25b1) projecting from the base in the pressurization direction of the opposed rotary body at a position on the base corresponding to or upstream from an upstream edge (N1) of the fixing nip (N) in a recording medium conveyance direction; and a downstream projection (25b2) projecting from the base in the pressurization direction of the opposed rotary body at a position on the base corresponding to or downstream from a downstream edge (N2) of the fixing nip (N) in the recording medium conveyance direction, the downstream projection (25b2) spaced apart from the upstream projection (25b1) in the recording medium conveyance direction, characterized in that the reflector is attached to the front edge of each of the upstream projection (25b1) and the downstream projection (25b2). an endless belt rotatable in a predetermined direction of rotation; a nip formation assembly disposed opposite an inner circumferential surface of the endless belt ; an opposed rotary body pressed against the nip formation assembly in a pressurization direction via the endless belt to form a fixing nip (N) between the endless belt and the opposed rotary body through which a recording medium bearing a toner image is conveyed; a heater ; a reflector ; and a support contacting and supporting the nip formation assembly , the support including: a base contacting the nip formation assembly ; an upstream projection (25b1) projecting from the base in the pressurization direction of the opposed rotary body at a position on the base corresponding to or upstream from an upstream edge (N1) of the fixing nip (N) in a recording medium conveyance direction; and a downstream projection (25b2) projecting from the base in the pressurization direction of the opposed rotary body at a position on the base corresponding to or downstream from a downstream edge (N2) of the fixing nip (N) in the recording medium conveyance direction, the downstream projection (25b2) spaced apart from the upstream projection (25b1) in the recording medium conveyance direction, characterized in that the reflector is attached to the front edge of each of the upstream projection (25b1) and the downstream projection (25b2). a base contacting the nip formation assembly ; an upstream projection (25b1) projecting from the base in the pressurization direction of the opposed rotary body at a position on the base corresponding to or upstream from an upstream edge (N1) of the fixing nip (N) in a recording medium conveyance direction; and a downstream projection (25b2) projecting from the base in the pressurization direction of the opposed rotary body at a position on the base corresponding to or downstream from a downstream edge (N2) of the fixing nip (N) in the recording medium conveyance direction, the downstream projection (25b2) spaced apart from the upstream projection (25b1) in the recording medium conveyance direction, characterized in that the reflector is attached to the front edge of each of the upstream projection (25b1) and the downstream projection (25b2). <EOS>