The present invention has a configuration in which a separating part is vertically disposed, and air bubbles generated from an electrode do not negatively affect the contact portion of a transfer film and the separating part. A positive electrode (32) is disposed at a position spaced a certain distance from a discharge part (50a) of electrophoresis gel chips (50) in the conveying direction (X) of a transfer film (1). In order to remove air bubbles generated from the positive electrode (32), an insulative electrode cover (35) is disposed over the positive electrode (32).
