In a screen printing apparatus which prints solder cream on a substrate by a closed type squeeze head, in print space 35 that houses the solder cream 5 pressurized in a paste storing part and brings the solder cream 5 into contact with a surface of a mask plate, a hollow heat regulating member 37 provided in a horizontal direction orthogonal to a squeezing direction is caused to pass, and a heat regulating medium is circulated inside the heat regulating member 37 by a heat regulator 40, whereby the solder cream 5 in the print space 35 can be always kept at an appropriate temperature and at an appropriate viscosity, so that print quality can be secured.