To obtain a plastic sheet for agriculture, capable of readily decomposing by embedding into soil after using, excellent in handleability and suitable for house for agriculture by each forming a wax layer on both side end parts in width direction of a sheet composed of a biodegradable plastic raw material.

This plastic sheet is obtained by each forming a wax layer 21 of carnauba wax, etc., on both side end parts 2 in the width direction of sheet (a) composed of a biodegradable plastic raw material such as a copolymer of 3-hydroxybutrate with 3-hydroxyvalerate. Furthermore, decomposition rate of the both side end parts 2 is preferably set so as to be slower than the decomposition rate of the central part 1 of the sheet.