A medical syringe (1100), comprising a tubular connection assist member (1130) increasing the holding force of a luer part (1140) inserted into a connected part (1200). The connection assist member is formed to be slid on the luer part or a body part in the state of being movable between a first position near the tip of the luer part and a second position apart from the tip of the luer part. When the connection assist member is moved to the second position, the tip of the luer part is exposed.
