Hollow foam moulding body through blow molding

The objective of the invention is to provide a hollow foam moulding body through blow molding, having a polypropylene resin foam layer with excellent foam performance, wherein an equilibrium compliance Je0 of the foam layer is more than 2.0*10<-3>Pa<-1>. The hollow foam moulding body is suitable for light and thin air-condition pipelines of a vehicle. The hollow foam moulding body is characterized in that the equilibrium compliance Je0 of the polypropylene resin foam layer is more than 2.0*10<-3>Pa<-1>, expansion S is less than 2.5, apparent density d is 0.20-0.65g/cm3, a rate of an average bubble diameter a of the moulding body in the thickness direction and an average bubble diameter c of the moulding body in the length direction is 0.1 to 0.5, an average moulding body thickness T of the moulding body is 1 to 5mm, and a thickness variation coefficient Cv is less than 50%.