The present invention aims to provide an anti-Alzheimer's disease agent based on an action mechanism associated with amyloid ² protein, which action mechanism is different from conventional action mechanisms. The therapeutic drug for Alzheimer's disease according to the present invention contains a therapeutic agent for cognitive impairment induced by amyloid ² protein, which therapeutic agent comprises a peptide having the amino acid sequence represented by SEQ ID NO:1 or a peptide similar to this peptide, especially a peptide containing the amino acid sequence represented by SEQ ID NO:2, which is a partial sequence of SEQ ID NO:1. \n VLSSQQFLHRGHQPPPEMAGHSLASSHRNSMIPSAAT (SEQ ID NO:1) \n HRGHQPPPEMA (SEQ ID NO:2)
TREATMENT AGENT FOR COGNITIVE DISORDERS, INDUCED BY AMYLOID -PROTEIN, THERAPEUTIC AGENT FOR ALZHEIMER'S DISEASE, AND TREATMENT METHOD AND PATHOLOGICAL ANALYSIS METHOD RELATED TO THESE