Construction machine

The invention relates to the field of engineering machinery. Two batteries (14) are secured to a swing frame (5) by using a battery securing device (21). The battery securing device (21) comprises a battery mount (22) which is secured to the swing frame (5), and whereon the batteries (14) are placed with a gap (S) therebetween; a bent section (23) which is provided on the battery mount (22) in such a way as to be located on the back surface side of the batteries (14), and serves to position the back surfaces of the batteries (14) in place; an insertion hole (25) which serves a hooking purpose and is provided on the battery mount (22) at a position that corresponds to the gap (S) between the batteries (14); a holding bracket (26) which is disposed in such a way as to straddle upper end corners on the front side of the adjacent batteries (14); a J-bolt (29) which is inserted through the gap (S) between the adjacent batteries (14), and connects together the holding bracket (26) and the insertion hole (25) servin