The altar in the side chapel was probably made around middle 20th century and refers to neo-baroque forms. It represents simplified, aedicula type, i.e. a single-storey, single-axis structure located on a pair of structural supports supporting the broken entablature. Unfortunately, archival sources did not reveal the reredos' author. The altar's iconography is dedicated to the Most Sacred Heart of Jesus.
Maria Działo, "The side altar in the chapel", [in:] "The Sacred Lesser Poland Heritage", 2025, source: https://sdm.upjp2.edu.pl/en/works/the-side-altar-in-the-chapel-1