A tray for loading battery caps , on which the battery caps are mountable, the tray comprising: first trays , each having a top surface, in which first grooves are defined, and a bottom surface, in which second grooves are defined; and second trays , each having a top surface, in which third grooves are defined, and a bottom surface, in which fourth grooves are defined and disposed above or below the first tray , wherein, when the first tray is disposed above the second tray , each of the second grooves and each of the third grooves communicate with each other to provide a communication space, and when the first tray is disposed below the second tray , each of the first grooves and each of the fourth grooves communicate with each other to provide a communication space, characterized in that the battery caps are mountable in a vertically erect state in the first tray and the second tray , wherein the first grooves and the second grooves are alternately arranged so that the second grooves are disposed between the first grooves adjacent to each other in the first tray , and the third grooves and the fourth grooves are alternately arranged so that the fourth grooves are disposed between the third grooves adjacent to each other in the second tray , and wherein, when the first tray and the second tray are stacked, and the battery caps are mounted in the space between the second groove and the third groove or the space between the first groove and the fourth groove , upper ends of the battery caps are restrictable in the second grooves or the fourth grooves , and lower ends of the battery caps are restrictable in the first grooves or the third grooves to prevent the first tray and the second tray from being separated. first trays , each having a top surface, in which first grooves are defined, and a bottom surface, in which second grooves are defined; and second trays , each having a top surface, in which third grooves are defined, and a bottom surface, in which fourth grooves are defined and disposed above or below the first tray , wherein, when the first tray is disposed above the second tray , each of the second grooves and each of the third grooves communicate with each other to provide a communication space, and when the first tray is disposed below the second tray , each of the first grooves and each of the fourth grooves communicate with each other to provide a communication space, characterized in that the battery caps are mountable in a vertically erect state in the first tray and the second tray , wherein the first grooves and the second grooves are alternately arranged so that the second grooves are disposed between the first grooves adjacent to each other in the first tray , and the third grooves and the fourth grooves are alternately arranged so that the fourth grooves are disposed between the third grooves adjacent to each other in the second tray , and wherein, when the first tray and the second tray are stacked, and the battery caps are mounted in the space between the second groove and the third groove or the space between the first groove and the fourth groove , upper ends of the battery caps are restrictable in the second grooves or the fourth grooves , and lower ends of the battery caps are restrictable in the first grooves or the third grooves to prevent the first tray and the second tray from being separated. <EOS>