PURPOSE: To provide a hollow molding method wherein a hollow molded item with a partially thick part can be obtd. without producing a thin part and whitening phenomenon at a bent part.

CONSTITUTION: A hollow mold 1 used for the title hollow molding method has a cavity 10 for preparing an assist grip as a hollow molded item having, for example, a bent part. This hollow mold 1 has a weir provided on the gas inlet side S in the neighborhood of an incourse 100 at a bent part forming part 13. When after a resin is fed into the cavity 10, a fluid is fed, the constitution is made in such a way that the fluid flows between the weir 11 and an outcourse 16.