The present invention prevents a defective display attributed to a non-uniform gap between a display element and a backlight which is caused by a phenomenon that an inner wall of a mold casing is shaved off by an end periphery of the display element and a shaved-off debris remains between the casing and the display element. Guide projections are integrally formed on an inner wall of a picture-frame-like portion of the mold casing and, at the same time, a gap which accommodates the shaved-off debris is formed between the guide projection and a bottom portion of the mold casing.