Pourmirzaei managed to lift 241kg and won the silver medal.
Jordanian athlete Jamil El Shebli also lifted 241kg but was awarded the gold medal due to his lighter body weight.
Faris Al-Ageeli from Iraq won the bronze medal with a 228kg lift.
Pourmirzaei sealed the fifth medal for Iranian powerlifting team in Tokyo.
Rouhollah Rostami (-80kg) won a gold medal. Amir Jafari (-65kg) and Hamed Solhipour (-97kg) claimed two silvers, and Saman Razi (-107kg) managed to claim a bronze.