PURPOSE: To safely transfer a radioactive powder by returning air sucked from a powdery product transfer original apparatus part in a glove box to said glove box to carry out negative pressure holding.

CONSTITUTION: In the apparatus for transferring a radioactive powder, an air trnsporting arranged pipe 86 for returning air sucked from a powdery product transfer original apparatus part in a glove box 201 into the glove box 201 of the powdery product transfer original apparatus part again is provided. By this mechanism, negative pressure variation in the glove box 201 is reduced and leakage of a nuclear substance from the inside of the glove box 201 to the outside thereof is prevented and the safe radioactive powder transfer apparatus is obtained.