It improves the adhesive strength of the adhesive with the impression material and the tray, at the same time is stabilized adhesive strength. The amino group including the polyamine compound and the solvent which 2 or more are included in 1 molecules, the alginate impression material for dentistry which becomes it makes the adhesive of the tray for impression.印象材とトレーとの間の接着剤の接着力を向上させ、かつ接着力を安定化させる。1分子中にアミノ基を2個以上含むポリアミン化合物および溶剤を含んでなる歯科用アルジネート印象材と印象用トレーとの接着剤とする。