A treatment device includes: a linear member which is deformable between a substantially straight state and a tissue catching state and which is configured to catch a treatment target in a state of being deformed in the tissue catching state； and first and second energy emitting portions provided in the linear member to catch the treatment target in cooperation with each other. The second energy emitting portion is apart from the first energy emitting portion, and is configured to emit energy to the treatment target from between the first energy emitting portion and to treat the treatment target.
