An infusion pump configured to feed a medicine to a patient by using an infusion tube, comprising: a tube attachment section to which the infusion tube is detachably attached; an access cover that closes the tube attachment section in an openable manner; and a tube clamp mechanism provided at the tube attachment section and configured to clamp and block a middle portion of the infusion tube, wherein, in the case where the access cover is opened, a blocking portion is formed at the infusion tube by a clip member by closing the clip member preliminarily attached to the middle portion of the infusion tube, and in the case where the access cover is closed, the blocking portion formed at the infusion tube is eliminated by opening the clip member, and characterized in that the tube clamp mechanism includes: a base member; a clip clamp member rotatably mounted on the base member and configured to clamp the clip member, wherein, in the case where the access cover is opened, the blocking portion is formed at the infusion tube by closing the clip member; a tube clamp member rotatably mounted on the base member, wherein, in the case where the access cover is opened, the blocking portion is formed at the infusion tube by closing the clip member by pressing the clip clamp member, and in the case where the access cover is closed, the blocking portion formed at the infusion tube is eliminated by the access cover pushing the clip clamp member and releasing the clip clamp member from being pressed to open the clip member; and a tube clamp release lever rotatably mounted on the base member, wherein, when the tube clamp release lever is pushed by a user, the tube clamp member is pushed up in a direction away from the infusion tube to enable the clip clamp member to be pushed up, causing the clip member to be clamped by the clip clamp member. a tube attachment section to which the infusion tube is detachably attached; an access cover that closes the tube attachment section in an openable manner; and a tube clamp mechanism provided at the tube attachment section and configured to clamp and block a middle portion of the infusion tube, wherein, in the case where the access cover is opened, a blocking portion is formed at the infusion tube by a clip member by closing the clip member preliminarily attached to the middle portion of the infusion tube, and in the case where the access cover is closed, the blocking portion formed at the infusion tube is eliminated by opening the clip member, and characterized in that the tube clamp mechanism includes: a base member; a clip clamp member rotatably mounted on the base member and configured to clamp the clip member, wherein, in the case where the access cover is opened, the blocking portion is formed at the infusion tube by closing the clip member; a tube clamp member rotatably mounted on the base member, wherein, in the case where the access cover is opened, the blocking portion is formed at the infusion tube by closing the clip member by pressing the clip clamp member, and in the case where the access cover is closed, the blocking portion formed at the infusion tube is eliminated by the access cover pushing the clip clamp member and releasing the clip clamp member from being pressed to open the clip member; and a tube clamp release lever rotatably mounted on the base member, wherein, when the tube clamp release lever is pushed by a user, the tube clamp member is pushed up in a direction away from the infusion tube to enable the clip clamp member to be pushed up, causing the clip member to be clamped by the clip clamp member. a base member; a clip clamp member rotatably mounted on the base member and configured to clamp the clip member, wherein, in the case where the access cover is opened, the blocking portion is formed at the infusion tube by closing the clip member; a tube clamp member rotatably mounted on the base member, wherein, in the case where the access cover is opened, the blocking portion is formed at the infusion tube by closing the clip member by pressing the clip clamp member, and in the case where the access cover is closed, the blocking portion formed at the infusion tube is eliminated by the access cover pushing the clip clamp member and releasing the clip clamp member from being pressed to open the clip member; and a tube clamp release lever rotatably mounted on the base member, wherein, when the tube clamp release lever is pushed by a user, the tube clamp member is pushed up in a direction away from the infusion tube to enable the clip clamp member to be pushed up, causing the clip member to be clamped by the clip clamp member.