A light reflecting member for a backlight module, comprising: a center reflecting part having a rectangular shape with two first opposite side portions (11, 13) and two second opposite side portions (12, 14); two first peripheral reflecting parts (Z2, Z4) each having a first trapezoidal shape with a first lower base and a first upper base, the first upper base being longer than the first lower base, the first peripheral reflecting parts (Z2, Z4) extending from the first opposite side portions (11, 13) of the center reflecting part, respectively; two second peripheral reflecting parts (Z3, Z5) each having a second trapezoidal shape with a second lower base and a second upper base, the second upper base being longer than the second lower base, the second peripheral reflecting parts (Z3, Z5) extending from the second opposite side portions (12, 14) of the center reflecting part, respectively; wherein side end portions of an adjacent pair of the first peripheral reflecting parts (Z2, Z4) and the second peripheral reflecting parts (Z3, Z5) abut against each other to form a corner section of the light reflecting member at a corner portion of the center reflecting part while the light reflecting member is attached to a frame; and the light reflecting member is formed by just a single sheet (8") as a one-piece, unitary member; characterized in that the light reflecting member further comprises: two first extension parts (81, 83) extending from the first upper bases of the first peripheral reflecting parts (Z2, Z4), respectively; and two second extension parts (82, 84) extending from the second upper bases of the second peripheral reflecting parts (Z3, Z5), respectively; wherein four insertion tabs are formed by one of the side end portions of each pair of the four adjacent pairs of the first peripheral reflecting part (Z2, Z4) and the second peripheral reflecting part (Z3, Z5); each insertion tab at least partially overlaps with the other of the side end portions of the adjacent pair of the first peripheral reflecting part (Z2, Z4) and the second peripheral reflecting part (Z3, Z5) where a corresponding slit is formed while the light reflecting member is attached to the frame; and each of the insertion tabs is configured to be inserted into the corresponding slit. a center reflecting part having a rectangular shape with two first opposite side portions (11, 13) and two second opposite side portions (12, 14); two first peripheral reflecting parts (Z2, Z4) each having a first trapezoidal shape with a first lower base and a first upper base, the first upper base being longer than the first lower base, the first peripheral reflecting parts (Z2, Z4) extending from the first opposite side portions (11, 13) of the center reflecting part, respectively; two second peripheral reflecting parts (Z3, Z5) each having a second trapezoidal shape with a second lower base and a second upper base, the second upper base being longer than the second lower base, the second peripheral reflecting parts (Z3, Z5) extending from the second opposite side portions (12, 14) of the center reflecting part, respectively; wherein side end portions of an adjacent pair of the first peripheral reflecting parts (Z2, Z4) and the second peripheral reflecting parts (Z3, Z5) abut against each other to form a corner section of the light reflecting member at a corner portion of the center reflecting part while the light reflecting member is attached to a frame; and the light reflecting member is formed by just a single sheet (8") as a one-piece, unitary member; characterized in that the light reflecting member further comprises: two first extension parts (81, 83) extending from the first upper bases of the first peripheral reflecting parts (Z2, Z4), respectively; and two second extension parts (82, 84) extending from the second upper bases of the second peripheral reflecting parts (Z3, Z5), respectively; two first extension parts (81, 83) extending from the first upper bases of the first peripheral reflecting parts (Z2, Z4), respectively; and two second extension parts (82, 84) extending from the second upper bases of the second peripheral reflecting parts (Z3, Z5), respectively; wherein four insertion tabs are formed by one of the side end portions of each pair of the four adjacent pairs of the first peripheral reflecting part (Z2, Z4) and the second peripheral reflecting part (Z3, Z5); each insertion tab at least partially overlaps with the other of the side end portions of the adjacent pair of the first peripheral reflecting part (Z2, Z4) and the second peripheral reflecting part (Z3, Z5) where a corresponding slit is formed while the light reflecting member is attached to the frame; and each of the insertion tabs is configured to be inserted into the corresponding slit.