An object of the present invention is to provide a preservation treatment apparatus which can sufficiently apply an effect generated by charges to an object to be preserved thus more surely exhibiting a preservation effect generated by charges, and can stably hold an effect of a potential applied to the object to be preserved by controlling the flow of an electric current in a stacked portion of the object. A preservation treatment apparatus includes: a conductive enclosure structure arranged at least either one of both sides or an upper side of the placing portion 1, and surrounding at least either one of both sides or the upper side of the object O as viewed from the object O placed on the placing surface; a first electrode 21 brought into contact with an upper position of the placing portion 1 close to one side portion 11S of the placing portion 1; a second electrode 22 brought into contact with a lower position of the placing portion 1 close to the other side portion 12S of the placing portion 1; a third electrode 23 brought into contact with a position of the enclosure structure close to one side portion of the enclosure structure; a fourth electrode 24 brought into contact with a position of the enclosure structure close to the other side portion of the enclosure structure; and a voltage supply portion 20 which is electrically connected with these electrodes respectively. The voltage supply portion 20 simultaneously applies a negative DC voltage to either one of the first electrode 21 and the second electrode 22 and applies an AC voltage to the other one of the first electrode 21 and the second electrode 22.