A processor performance analysis device analyzes performance of a multithreaded processor in a system LSI which includes: the multithreaded processor which executes processing in parallel using multiple logical processors; a functional core which executes processing different from the processing executed by the multithreaded processor; and a memory interface which receives each access request and controls access to memory. The processor performance analysis device includes: an operational information output unit which monitors the multithreaded processor to output operational information; an access information output unit which monitors the memory interface to output memory access information; and an analysis information output unit which analyzes the performance of the multithreaded processor using the operational information and the memory access information.