A lens frame unit comprising: a lens frame body for housing an optical member; a heat transfer unit for covering at least part of the lens frame body; a heat-generating unit for generating heat; a temperature measurement unit for measuring temperature; and a single electrical wiring board on which the heat-generating unit and the temperature measurement unit are mounted, wherein the heat-generating unit and the temperature measurement unit are arranged separately from each other on the electrical wiring board and between the electrical wiring board and the heat transfer unit, and are arranged to be in contact with the heat transfer unit, the thermal resistance between closest positions of the heat-generating unit and the temperature measurement unit is greater than a thermal resistance between the heat-generating unit and the heat transfer unit, and a thermal resistance between the temperature measurement unit and the heat transfer unit, characterized in that the lens frame unit further comprises a first coupling layer disposed between the heat-generating unit and the heat transfer unit and a second coupling layer disposed between the temperature measurement unit and the heat transfer unit, wherein when the heat-generating unit, the heat transfer unit and the temperature measurement unit are coupled by the second coupling layer and the first coupling layer, relations of d1/λ1+h1/λ5<w/λ3 and d2/λ2+h2/λ6<w/λA3 are satisfied, where thickness of the heat-generating unit is denoted by d1, heat conductivity of material of the heat-generating unit is denoted by λ1, thickness of the temperature measurement unit is denoted by d2, heat conductivity of material of the temperature measurement unit is denoted by λ2, distance between the closest positions of the heat-generating unit and the temperature measurement unit is denoted by w, heat conductivity between the heat-generating unit and the temperature measurement unit is denoted by λ3, thickness of the first coupling layer is denoted by h1, heat conductivity of the first coupling layer is denoted by λ5, thickness of the second coupling layer is denoted by h2, and heat conductivity of the second coupling layer is denoted by λ6, and wherein a relation of h1/λ5<h2/λ6 is satisfied. a lens frame body for housing an optical member; a heat transfer unit for covering at least part of the lens frame body; a heat-generating unit for generating heat; a temperature measurement unit for measuring temperature; and a single electrical wiring board on which the heat-generating unit and the temperature measurement unit are mounted, wherein the heat-generating unit and the temperature measurement unit are arranged separately from each other on the electrical wiring board and between the electrical wiring board and the heat transfer unit, and are arranged to be in contact with the heat transfer unit, the thermal resistance between closest positions of the heat-generating unit and the temperature measurement unit is greater than a thermal resistance between the heat-generating unit and the heat transfer unit, and a thermal resistance between the temperature measurement unit and the heat transfer unit, characterized in that the lens frame unit further comprises a first coupling layer disposed between the heat-generating unit and the heat transfer unit and a second coupling layer disposed between the temperature measurement unit and the heat transfer unit, wherein when the heat-generating unit, the heat transfer unit and the temperature measurement unit are coupled by the second coupling layer and the first coupling layer, relations of d1/λ1+h1/λ5<w/λ3 and d2/λ2+h2/λ6<w/λA3 are satisfied, where thickness of the heat-generating unit is denoted by d1, heat conductivity of material of the heat-generating unit is denoted by λ1, thickness of the temperature measurement unit is denoted by d2, heat conductivity of material of the temperature measurement unit is denoted by λ2, distance between the closest positions of the heat-generating unit and the temperature measurement unit is denoted by w, heat conductivity between the heat-generating unit and the temperature measurement unit is denoted by λ3, thickness of the first coupling layer is denoted by h1, heat conductivity of the first coupling layer is denoted by λ5, thickness of the second coupling layer is denoted by h2, and heat conductivity of the second coupling layer is denoted by λ6, and wherein a relation of h1/λ5<h2/λ6 is satisfied.