To provide a new earthquake-proof structure that comprises precast concrete boards lower in cost than steel plates and no refractory cover necessary for them, adopts a structure applying no large loads to beams, and can be used or various building types, including Steel structure, Steel Reinforced Concrete structure, Reinforced Concrete structure, etc., at low cost.

Within a structural frame consisting of columns 1 and beams 2, a plurality of precast concrete boards 3 are arranged in a vertical or horizontal direction, so that their longitudinal surfaces may face one another, and a viscoelastic material 5 is filled in the clearances formed between adjacent precast concrete boards and between precast concrete boards and columns or beams, or a plurality of precast concrete boards are attached in piles to the column side surfaces facing inward the structural frame and the viscoelastic material 5 is filled in the clearances formed between adjacent precast concrete boards and between the columns and precast concrete boards.