Transparency changeable board and selective light transmitting apparatus with the same

A transparency-changeable board and a selective light-transmitting apparatus with the same are provided to enable a user to adjust the amount of sunlight transmitted. A transparency-changeable board(10A) comprises the following units. A first transparent plate(11) is made of glass or plastic. An electronic paper(20) whose front is transparent is adhered to the one side of the first transparent plate. A second transparent plate(13) made of glass or plastic is adhered to the other side of the electronic paper, which is not attached to the first transparent plate. Owing to a signal inputted on the electronic paper, some of pixels included in the electronic paper become non-transparent such that the transparency degree of electronic paper varies.