To aim at outputting video signals causing a viewer to feel none of a sense of discomfort even if a partial or entire lack of the picture occurs in a device that decodes a datastream of a compressed moving picture of one-segment broadcasting etc and outputs the video signals. A moving picture data decoding device includes a buffer unit 26 buffered with a predetermined quantity of already-decoded pictures decoded by a decoding process, and a picture generation unit 23 configured to generate pictures and, if there is a missing picture used for interframe prediction (S202), performing the picture generation (S205) in a way that acquires a substitute reference picture with which to substitute the missing picture from the already-decoded pictures buffered in the buffer unit 26 (S203).