Japanese has an extensive set of 'mimetic' words usually called 'onomatopoeia'. Although they are essential to express our emotions and to describe various things vividly, they seem not to have been taught often in Japanese classes. The author argues what kinds of Japanese 'onomatopoeia' appear in textbooks and teaching materials now widely used. She also presents her idea as to how she has chosen "30 'Basic Onomatopoeia in Japanese" based on the result of the above- mentioned argument and a little survey on basic Japanese vocabularies. The author finally tries to show a list of co-occurence of 'onomatopoeia' and basic verbs and claims how certain kinds of sentence structures, under which those co-occurences are realized, can enable students to understand the usages of 'onomatopoeic' expressions.