(57) An improved polyester mesh for screen printing is given. The polyester mesh is composed of polyester fibers having conca­vities and protrusions having a diameter of 0.01 to 0.1 µm in a density of at least 200 per µm² of the surface area thereof. A more preferred polyester mesh for screen printing has finely dispersed concavities and protrusions having a depth or height not exceeding 0.05 µm. Such a polyester mesh is obtained by subjecting a base polyester mesh to a treatment with low-temperature plasma in an atmosphere of a non-oxidizing inorganic gas. An improvement for printing screens is proposed in which a surface active agent is ad­ded to the photosensitive resin.