A battery module housing having a rectangular tube structure in which an inner space for accommodating battery cells is formed, the battery module housing comprising: a first side plate and a second side plate made of metal material disposed upright to face each other, the first side plate and the second side plate respectively having target portions (11, 12; 21, 22) defined as an upper end and a lower end thereof and spacers (13, 14; 23, 24) vertically protruding from the target portions (11, 12; 21, 22); and a top plate and a bottom plate made of metal material respectively disposed horizontally at an upper portion and a lower portion of the first side plate and the second side plate, characterized in that the top plate and the bottom plate respectively have flyer portions (31, 32; 41, 42) joined to the target portions (11, 12; 21, 22) by means of electromagnetic pulse joining in a state of being supported by the spacers (13, 14) of the first side plate and the spacers (23, 24) of the second side plate to keep a gap with the target portions (11, 12; 21, 22), wherein the flyer portions are defined as both ends of the top plate and the bottom plate, and the top plate and the bottom plate respectively include a cover portion (33, 43) formed between the flyer portions (31, 32; 41, 42) located at both ends thereof to have a greater thickness than the flyer portions (31, 32; 41, 42), and wherein the cover portions (33, 43) are fitted into a space between the spacers (13, 14) of the first side plate and the spacers (23, 24) of the second side plate to be positioned with respect to the first side plate and the second side plate, wherein the flyer portion (31, 32; 41, 42) includes a non-joined region (31a, 32a; 41a, 42a), which extends longer than the length of the target portion (11, 12; 21, 22) before the electromagnetic pulse joining is performed and thus is not joined with the target portion (11, 12; 21, 22), and a notch being provided at the boundary line between the non-joined section and the joined section of the flyer portion and configured to guide the non-joined region (31a, 32a; 41a, 42a) to be cut off due to an impact when the electromagnetic pulse joining is performed. a first side plate and a second side plate made of metal material disposed upright to face each other, the first side plate and the second side plate respectively having target portions (11, 12; 21, 22) defined as an upper end and a lower end thereof and spacers (13, 14; 23, 24) vertically protruding from the target portions (11, 12; 21, 22); and a top plate and a bottom plate made of metal material respectively disposed horizontally at an upper portion and a lower portion of the first side plate and the second side plate, characterized in that the top plate and the bottom plate respectively have flyer portions (31, 32; 41, 42) joined to the target portions (11, 12; 21, 22) by means of electromagnetic pulse joining in a state of being supported by the spacers (13, 14) of the first side plate and the spacers (23, 24) of the second side plate to keep a gap with the target portions (11, 12; 21, 22), wherein the flyer portions are defined as both ends of the top plate and the bottom plate, and the top plate and the bottom plate respectively include a cover portion (33, 43) formed between the flyer portions (31, 32; 41, 42) located at both ends thereof to have a greater thickness than the flyer portions (31, 32; 41, 42), and wherein the cover portions (33, 43) are fitted into a space between the spacers (13, 14) of the first side plate and the spacers (23, 24) of the second side plate to be positioned with respect to the first side plate and the second side plate, wherein the flyer portion (31, 32; 41, 42) includes a non-joined region (31a, 32a; 41a, 42a), which extends longer than the length of the target portion (11, 12; 21, 22) before the electromagnetic pulse joining is performed and thus is not joined with the target portion (11, 12; 21, 22), and a notch being provided at the boundary line between the non-joined section and the joined section of the flyer portion and configured to guide the non-joined region (31a, 32a; 41a, 42a) to be cut off due to an impact when the electromagnetic pulse joining is performed.