DEVICE FOR INSPECTING SIDE SURFACE OF CYLINDRICAL BATTERY

In an embodiment, the present invention provides a side surface inspection device of a cylindrical battery which has a first area that is a part of a side surface, a second area that is another part of the side surface, a third area that is still another part of the side surface, and a fourth area that is a remaining part of the side surface, the first area, the second area, the third area, and the four area being adjacent to each other and arranged sequentially along a circumference. The side surface inspection device includes a first lighting which emits light in a direction toward the side surface of the cylindrical battery; a plurality of mirrors including a first mirror, a second mirror, a third mirror, and a fourth mirror which reflect light emitted from the first lighting to make the light incident on each of the first area, the second area, the third area and the fourth area of the cylindrical battery, and reflect the lights reflected by each of the first area, the second area, the third area, and the fourth area of the cylindrical battery again; and a camera on which light reflected by each of the plurality of mirrors again is incident and which forms an image including images of the first area, the second area, the third area and the fourth area of the cylindrical battery.