This research aims to describe compliance of politeness principle in testimonial
conversations between sellers and buyers on Instagram account. It employed
descriptive qualitative study. The data in this study were testimonial conversations of
sellers and buyers that contain the principle of politeness from April to June 2018
edition of the fashion category on Instagram account, while the source of research
data was discourses of testimonial conversation between sellers and buyers. This
research was conducted in three cycles. In data provision stage, the methods used
were observation method and note-taking technique. Data analysis used was
pragmatic comparative method and read-marker technique. In presenting the results
of data analysis, it used informal method. The finding reveals that there are 16
instagram accounts that contain testimonial conversation in fashion category on April
to June 2018 in Purwokerto. There 36 utterances that apply politeness principle. 36
utterances are 10 utterances that apply maxim of tact, 3 utterances that apply maxim
of generosity, 13 utterances that apply maxim of praise, 2 utterances that apply maxim
of humility, 5 utterances that apply maxim of agreement, 3 utterances that apply
maxim of sympathy. Of the six maxims that Leech explained in the testimonial
conversation, praise maxim dominates the implementation of politeness principle. It is
proven that many utterances that praise the informant.