An objective of the present invention is to provide a mid-to-large battery pack of an industrial electric vehicle having a heavy body which can realize both supply of electric energy to an industrial electric vehicle and weight balance. According to embodiments of the present invention, the mid-to-large battery pack of an industrial electric vehicle having a heavy body comprises: a box; a module assembly including a plurality of battery modules in which electric energy is charged, a plurality of module cases accommodating the battery modules, and a busbar connected to positive and negative power of the battery modules to electrically carry current; and a support member to accommodate and support a plurality of module assemblies sequentially stacked in the box. The support member includes a heavy plate made of at least one among cast iron, stone, lead, and concrete.
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