noun
shrine building for votive picture tablets
A building at a Shinto shrine where ema (votive picture tablets) are hung. The term is rare; most people simply refer to the ema hanging area without a specific building name.
神社の境内にある絵馬殿には、たくさんの絵馬がかけられていた。
In the shrine grounds, many votive tablets were hung in the ema hall.
絵馬掛け所 is a more common term for the area or rack where ema are hung, whereas 絵馬殿 implies a dedicated hall or building.
Compound of 絵馬 (ema, 'votive picture tablet') and 殿 (den, 'hall' or 'palace'). The exact historical derivation is uncertain, but the term straightforwardly describes a hall for ema.