A die plate for a die block can have a coat-hanger-shaped flow path for extruding a molten foamable thermoplastic resin in a form of a sheet. The die plate can be on a downstream side of the coat-hanger-shaped flow path to make a flow rate of the molten foamable thermoplastic resin uniform in a width direction. The die plate can have a multiplicity of delivery apertures. The delivery apertures in opposite side regions can have a diameter greater than a diameter which the delivery apertures in a center region have. A die unit can include a die block, which has a multiple bifurcated manifold terminating in plural coat-hanger-shaped flow paths at downward ends thereof, and a like plural number of similar die plates as described above. A process for producing a wide thermoplastic resin foam can use the die unit.