A drilling machine comprising: a frame having a lower wall portion removably attached to a workpiece to be subjected to drilling and a front wall portion contiguous with the lower wall portion and extending upward from the lower wall portion to form an L-shape together with the lower wall portion, the frame being made of a metallic material; a drilling drive unit having a motor for rotationally driving a drilling tool, the drilling drive unit being attached to a front side of the front wall portion so as to be vertically movable along the front wall portion to bring the drilling tool toward and away from the workpiece, with the lower wall portion secured to the workpiece; and a battery housing prepared separately from the frame and made of a resin material, the battery housing being attached to the frame to form a body unit of the drilling machine together with the frame, the battery housing having an intermediate wall portion positioned directly above the lower wall portion and extending apart from and parallel to the front wall portion and a bottom wall portion extending rearward from the intermediate wall portion, the intermediate wall portion and the bottom wall portion cooperating to define a battery accommodating space to removably receive a battery as a power source for driving the motor such that at least a portion of the battery accommodating space is positioned at a rear side of the front wall portion and directly above the lower wall portion, the battery housing comprising a right-side part and a left-side part, which are attached to the frame in such a manner as to sandwich the frame therebetween from right and left sides. a frame having a lower wall portion removably attached to a workpiece to be subjected to drilling and a front wall portion contiguous with the lower wall portion and extending upward from the lower wall portion to form an L-shape together with the lower wall portion, the frame being made of a metallic material; a drilling drive unit having a motor for rotationally driving a drilling tool, the drilling drive unit being attached to a front side of the front wall portion so as to be vertically movable along the front wall portion to bring the drilling tool toward and away from the workpiece, with the lower wall portion secured to the workpiece; and a battery housing prepared separately from the frame and made of a resin material, the battery housing being attached to the frame to form a body unit of the drilling machine together with the frame, the battery housing having an intermediate wall portion positioned directly above the lower wall portion and extending apart from and parallel to the front wall portion and a bottom wall portion extending rearward from the intermediate wall portion, the intermediate wall portion and the bottom wall portion cooperating to define a battery accommodating space to removably receive a battery as a power source for driving the motor such that at least a portion of the battery accommodating space is positioned at a rear side of the front wall portion and directly above the lower wall portion, the battery housing comprising a right-side part and a left-side part, which are attached to the frame in such a manner as to sandwich the frame therebetween from right and left sides.