An object of the present invention is to provide a plastic cell having a sealing part that does not lose a sealing property even in a case where a plastic substrate is deformed into a free shape with roughness or curved surfaces, and a method for manufacturing the same. The plastic cell of the present invention is a plastic cell including a first plastic substrate, a first transparent conductive layer, a fluid layer, a second transparent conductive layer, and a second plastic substrate, in this order, in which the plastic cell further includes a sealing part that seals the fluid layer by deformation of a part of the first plastic substrate or the second plastic substrate, and the sealing part is a sealing part having a region of a wavy line shape that satisfies Expression (1), P≤40 A  (1) in Expression (1), P represents a period of the wavy line shape, and A represents an amplitude of the wavy line shape.