The present invention addresses the problem of providing: an Alzheimer-type dementia preventing agent which is safe and therefore can be ingested everyday, can be used as a health food, and can prevent Alzheimer-type dementia; and a method for producing the Alzheimer-type dementia preventing agent. The present invention also addresses the problem of providing: a use of an aerial part of sesame (Sesamum indicum) or an extract thereof for the prevention of Alzheimer-type dementia; and a method for preventing Alzheimer-type dementia. The Alzheimer-type dementia preventing agent according to the present invention is characterized by containing an aerial part of sesame (Sesamum indicum) or an extract thereof as an active ingredient.

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