本研究の目的は，あいまいさへの耐性と集団同一性が，新入成員への寛容的反応に及ぼす効果を検討することである．寛容的反応尺度の因子分析により ，積極的関与と異質耐性が抽出された．この下位尺度を用いて，あいまいさへの耐性と集団同一性が，寛容的反応に及ぼす効果を検討した（被験者：大学生，専門学校生310名）．あいまいさへの耐性は，異質耐性を向上させていた．一方，集団同一性は，積極的関与を高める効果を示した．異質耐性に対して，あいまいさへの耐性と集団同一性との交互作用効果がみられた．これらの結果の検討を通して，新入成員への寛容的反応の生起に必要な条件が考察された．

This study examined the relationship of ambiguity tolerance and group identification with attitudes toward a newcomer to ingroup. Tree hundred and ten (310) college and vocational school students completed a questionnaire of several scales. First, factor analysis found two factors for a tolerant acceptance scale: attitudes of positive commitment and heterogeneity tolerance. Then, respondents were median-split in terms of ambiguity tolerance and group identification, both making high and low groups. Analysis of variance were conducted on the two attitude variables with ambiguity tolerance and group identification as independent variables. High ambiguity tolerance was associated with high heterogeneity tolerance, and high group identification with high positive commitment. And an interaction effect of two was found on heterogeneity tolerance. Implications for conditions necessary for tolerant acceptance of a newcomer were discussed.

Key words: tolerant acceptance of newcomer, tolerance of ambiguity, group identification, tolerance of heterogeneity