A dust-proof frame 30 includes a front frame portion 32 located on the outer periphery of the front surface of a display panel unit 20. The dust-proof frame 30 includes a convex portion 31 that projects from the front frame portion 32 toward the inner surface of a housing 10. A gap G1 is located in a pressing direction of the inner surface of the housing 10 with respect to the convex portion 31 and extends along the convex portion 31 is provided in the dust-proof frame 30. According to the above structure, the function of the dust-proof frame 30 can be improved.