Abstract: A frame (3) for supporting a color selection electrode body (2) under tension includes a pair of first frames (10) arranged in the horizontal direction and a pair of second frames (20) arranged in the vertical direction. The first frames (10) are each formed by bending a sheet material into a substantially triangular sectional shape, whose three side faces are formed by a first support part (12), a second support part (14) and a third support part (16). Projections (30) each having a shear plane (32) are formed in an inner position of the one side edge of the first support part (12). The other side edge (16a)) of the third support part (16) is arranged to be in contact with a main surface of the first support part (12) and the shear plane (32) of each of the projections (30). Shearing force acting between the other side edge (16a)) of the third support part (16) and first support part (12) is received by the projections (30).