The oldest part of the church is the presbytery, which was completed before 1480. This date was inscribed on a support beam, and probably indicates the year in which expansion was begun. According to the monument registry of the Kingdom of Poland, construction first began in 1326. The presbytery entrance is framed by a 15th-century painted screen of the Passion of Jesus Christ. To the sides are 17th-century stalls. A music pulpit that dates back to 1633, and which is the oldest such monument of its kind in Europe, can be found on the altar.