To provide a method capable of stably manufacturing a lens sheet of high quality by solving problems that the life of a mold is lowered by foreign matter such as dust or the like easy to adhere to the surface of a base material sheet in a lens sheet manufacturing method including a process for forming a radiation curable resin layer on the base material sheet and forming a lens shape to the surface of the resin layer by transfer to form a lens part and the appearance of a product is damaged by the mixing with foreign matter to lower the quality of the product.

A pressure-sensitive adhesive roll is pressed to the surface of the base material sheet to remove the foreign matter on the surface of the base material sheet before forming the lens part.