This study is about the correlation between articulation function and human relationship in ``negativizing of the expression of positive treatment`` in Japanese. The results of this study are as follows 4 articulation functions were found in each human relation: ``intimacy``, ``concern``, ``complement`` and ``gratitude``. ``negativizing of the expression of positive treatment`` was often used to express ``intimacy`` in the human relationship between subordinates and superiors. It is assumed that the reasons why a speaker uses ``the expression of negative treatment``, which is not fit to speech type, by implying his or her intent of expression are that 1) there is an implicit agreement between speaker and listener to acknowledge the use of such expression because they are close to each other enough, 2) speaker and listener believe that such linguistic behavior can solidify the bond between them, 3) speaker thinks that linguistic behavior can express his or her intention more strongly and increase the effect of articulation, and 4) speaker and listener are close but not close enough, so they can``t express their inner mind candidly to each other.