A tissue closing device for closing an opening penetrating a tissue membrane in a living body includes a closure configured to close the opening and a device configured to deploy the closure. The closure includes a seal portion and a deformation portion for covering the opening and tissue membrane surrounding the opening from opposite sides, and a connecting portion connecting the seal portion and the deformation portion. The arrangement device includes a storing member for storing the deformation portion and supporting the connecting member, and a hand-operated portion on the proximal side of the storing member. The storing member includes a take-out port which is openable from a closed state. The deformation portion is discharged exterior of the storing member by opening the take-out port.
