PURPOSE: To prepare a polyimide type laminated sheet having a stable quality, by laminating a plurality of base materials of continuous length impregnated with a polyimide resin, passing it between a group of a plurality of press rolls and pressing it while being heated to cure the polyimide resin.

CONSTITUTION: A base material 1 of continuous length wound in a coil-like shape is unwound, and is impregnated with a polyimide resin 2 by immersing it in a polyimide resin 2 vanish and so on while being transferred continuously, and is sent continuously while being laminated. Moreover, metal foils 9 of continuous length are continuously laminated on one or both faces thereof while being unwound from a coil. Then, the lamination of a plurality of base materials 1 of continuous length impregnated with the polyimide resin like this and the metal foil 9 is sent continuously between a group of press rolls 3, 3 and molding where the polyimide resin is cured by pressing while being heated can be carried out. It is thereby possible to obtain a laminated body of continuous length where the base materials 1 among themselves and the base materials 1 and the metal foils 9 are integrally laminated with the cured polyimide resin. A laminated plate A is obtained by cutting the laminated body 4 of continuous length thus prepared in a required dimension by means of a cutting apparatus 12.