The Archaeological Museum of Nemea was constructed as part of the excavation project carried out by the University of California at Berkeley, thanks to the generosity of Mr. Rudolph A. Peterson. It was dedicated and presented formally to the Greek State on May 28, 1984. The entrance is located on the west side. The foyer opens on a courtyard, opposite the entrance, and on the main exhibition hall.

The museum contains a collection of pictures of Nemea by travellers of the 18th and 20th centuries, coins of ancient visitors to Nemea, items related to the athletic activity on the site, prehistoric finds (pottery, tools, weapons etc.) from sites in the district of Nemea, pottery and jewellery from the Mycenaean cemetery at Aidonia and the settlement of Aghia Eirene, architectural parts from monuments at Nemea and other sites, and a collection of inscriptions from Nemea, Phlius and Petri.