Cover and energy source having selbiges

problem Providing a cover member which is adapted to be attached to a bus bar module, and a power source, which has the cover member. Means for solving the problem A cover 1 is attached to a busbar module. 6 The bus bar module 6 comprises: a plurality of bus bars that connect adjacent respective batteries of a battery pack which is formed from a plurality of batteries, which overlap each other; a main body 8 on which the bus bars are mounted and which overlaps with the battery unit; a plurality of positioning projections 29 and a plurality of Verrastungsabschnitten 30 which are provided on the main body. 8 The cover member 1 includes: a plurality of cover portions 10, which are arranged parallel to a overlapping direction X of the batteries and covering the bus bars; and a plurality of elastically deformable portions 14, which connect the adjacent cover portions 10 movable. Each of the cover portions includes: a positioning hole 11 into which the positioning projection 29 is inserted; and a latch receiving portion 12 to which the latch portion is latched 30th The positioning hole 11 is formed in a shape such that the positioning projection 29 is movable in the overlapping direction X of the batteries.