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The purpose of this paper is to study constraints on middle verbs and implicit argument focusing on its way of presence and genericity. We examine affectedness constraint, aspectual constraint, and causativity constraint, and among them, aspectual constraint is proved to be the most convincing constraint of middle verb formation. We also prove that presence of an implicit argument is a defining characteristic of middles. The implicit argument of middle is syntactically unexpressed but semantically present. However, there are different opinions of the way of presence of an implicit argument. In addition, although the external argument is understood to be people in general, even middles lacking genericity involve an implicit argument. A specific person can be engaged in the interpretation of an implicit argument. Therefore, genericity is not an essential property of middles.