A backlight device for a liquid crystal module, comprising: a linear light source configured to emit light; a light reflecting member arranged to reflect the light emitted from the light source toward a liquid crystal cell of the liquid crystal module, the light reflecting member including: a center reflecting face that is formed in a rectangular shape and disposed rearward with respect to the light source, a pair of first peripheral reflecting faces (Z2, Z4), each formed in a trapezoidal shape and extending from a pair of first opposing side portions of the center reflecting face frontward and outward with respect to the center reflecting face, respectively, and a pair of second peripheral reflecting faces (Z3, Z5), each formed in a trapezoidal shape and extending from a pair of second opposing side portions of the center reflecting face frontward and outward with respect to the center reflecting face, respectively, a plurality of optical sheets disposed frontward with respect to the light reflecting member; and a frame supporting the light reflecting member and the plurality of optical sheets, the light reflecting member further including extension tabs (81, 82, 83, 84) extending from outer peripheral edges of the first and second peripheral reflecting faces (Z2, Z3, Z4, Z5), respectively, the extension tabs (81, 82, 83, 84) being supported by side plates of the frame, respectively, between the plurality of optical sheets and the side plates of the frame in a plan view, the center reflecting face, the first and second peripheral reflecting faces (Z2, Z4, Z3, Z5), and the extension tabs (81, 82, 83, 84) being integrally formed from a sheet-like member as a one-piece, unitary member, the optical sheets being supported by the side plates of the frame, and in the plan view, the side plates of the frame supporting the optical sheets by being directly under the outer peripheral edges of the optical sheets via the respective extension tabs (81, 82, 83, 84). a linear light source configured to emit light; a light reflecting member arranged to reflect the light emitted from the light source toward a liquid crystal cell of the liquid crystal module, the light reflecting member including: a center reflecting face that is formed in a rectangular shape and disposed rearward with respect to the light source, a pair of first peripheral reflecting faces (Z2, Z4), each formed in a trapezoidal shape and extending from a pair of first opposing side portions of the center reflecting face frontward and outward with respect to the center reflecting face, respectively, and a pair of second peripheral reflecting faces (Z3, Z5), each formed in a trapezoidal shape and extending from a pair of second opposing side portions of the center reflecting face frontward and outward with respect to the center reflecting face, respectively, a center reflecting face that is formed in a rectangular shape and disposed rearward with respect to the light source, a pair of first peripheral reflecting faces (Z2, Z4), each formed in a trapezoidal shape and extending from a pair of first opposing side portions of the center reflecting face frontward and outward with respect to the center reflecting face, respectively, and a pair of second peripheral reflecting faces (Z3, Z5), each formed in a trapezoidal shape and extending from a pair of second opposing side portions of the center reflecting face frontward and outward with respect to the center reflecting face, respectively, a plurality of optical sheets disposed frontward with respect to the light reflecting member; and a frame supporting the light reflecting member and the plurality of optical sheets, the light reflecting member further including extension tabs (81, 82, 83, 84) extending from outer peripheral edges of the first and second peripheral reflecting faces (Z2, Z3, Z4, Z5), respectively, the extension tabs (81, 82, 83, 84) being supported by side plates of the frame, respectively, between the plurality of optical sheets and the side plates of the frame in a plan view, the center reflecting face, the first and second peripheral reflecting faces (Z2, Z4, Z3, Z5), and the extension tabs (81, 82, 83, 84) being integrally formed from a sheet-like member as a one-piece, unitary member, the optical sheets being supported by the side plates of the frame, and in the plan view, the side plates of the frame supporting the optical sheets by being directly under the outer peripheral edges of the optical sheets via the respective extension tabs (81, 82, 83, 84).