The almost square building opposite the holy hall dates from the 2nd century B.C. in the stand visible today. It has a special feature. The cavea is not semicircular as usual, the seating steps are rectangular to each other.
To the right and to the left of the entrance, where walls had to be built, there are 10 rows of steps. Opposite the entrance, where the builders could use the natural rock slope, there were once 16 rows. This resulted in seating for up to 500 people. Right and left in the corners, where the rows of seats meet, stairs led up. Just as directly along the forehead-sided wall.

The stairs led to a gallery whose outer wall and the roof-bearing columns formed the back of the building. A door led to the upper street. In the middle of the orchestra there is still a marble altar. It is decorated with busts of gods, bull heads with wreaths and laurel leaves. The altar dates back to the 2nd century BC. The building had a saddle roof supported by two parallel rows of columns on the sides.