A liquid medicine administration apparatus (2, 102) comprising: a drive section; an operation section configured to operate a pusher member slidably provided in a liquid medicine container to accommodate a liquid medicine; a transmission mechanism configured to transmit driving force of the drive section to the operation section; an occlusion detection mechanism provided in the transmission mechanism and configured to detect occlusion of a passage of the liquid medicine administered from the liquid medicine container; a rotation detector configured to detect rotation of the drive section, and a notification section configured to notify a user when the rotation detector detects stoppage of rotation of the drive section; wherein the occlusion detection mechanism includes: a drive side gear section to mesh with a gear on the drive section side; a pusher side gear section configured to rotate together with the drive side gear section and mesh with a gear on the operation section side; and a locking mechanism configured to stop the rotation of the drive side gear section when rotational resistance applied to the pusher side gear section exceeds predetermined force, characterized in that the occlusion detection mechanism includes: a rotation shaft configured to rotatably support the drive side gear section and the pusher side gear section; and a temporary retainer (43, 123) configured to temporarily retain the drive side gear section at a predetermined position with respect to the rotation shaft. a drive section; an operation section configured to operate a pusher member slidably provided in a liquid medicine container to accommodate a liquid medicine; a transmission mechanism configured to transmit driving force of the drive section to the operation section; an occlusion detection mechanism provided in the transmission mechanism and configured to detect occlusion of a passage of the liquid medicine administered from the liquid medicine container; a rotation detector configured to detect rotation of the drive section, and a notification section configured to notify a user when the rotation detector detects stoppage of rotation of the drive section; wherein the occlusion detection mechanism includes: a drive side gear section to mesh with a gear on the drive section side; a pusher side gear section configured to rotate together with the drive side gear section and mesh with a gear on the operation section side; and a locking mechanism configured to stop the rotation of the drive side gear section when rotational resistance applied to the pusher side gear section exceeds predetermined force, characterized in that the occlusion detection mechanism includes: a rotation shaft configured to rotatably support the drive side gear section and the pusher side gear section; and a temporary retainer (43, 123) configured to temporarily retain the drive side gear section at a predetermined position with respect to the rotation shaft. a drive side gear section to mesh with a gear on the drive section side; a pusher side gear section configured to rotate together with the drive side gear section and mesh with a gear on the operation section side; and a locking mechanism configured to stop the rotation of the drive side gear section when rotational resistance applied to the pusher side gear section exceeds predetermined force, characterized in that the occlusion detection mechanism includes: a rotation shaft configured to rotatably support the drive side gear section and the pusher side gear section; and a temporary retainer (43, 123) configured to temporarily retain the drive side gear section at a predetermined position with respect to the rotation shaft. a rotation shaft configured to rotatably support the drive side gear section and the pusher side gear section; and a temporary retainer (43, 123) configured to temporarily retain the drive side gear section at a predetermined position with respect to the rotation shaft.