The invention provides a compound used as NMDA receptor antagonistic agent. A study was made on a compound having an antagonistic activity on an NMDA receptor, and it was confirmed that a fused indane compound according to the invention had an excellent antagonistic activity on an NMDA receptor.The fused indane compound has an excellent antagonistic activity on an NMDA receptor, and therefore canbe used as an active ingredient for a prophylactic and/or therapeutic agent for Alzheimer's disease, vascular dementia, Parkinson's disease, intractable depression, attention deficit hyperactivity disorder, migraine or the like.