Masaru Corporation is a Japanese construction company. It carries out building repair and renovation, condominium and building renewal, and skyscraper sealing and waterproofing work. It also constructs facilities such as air conditioning, heating and cooling, and water supply and drainage systems, and assembles, installs, and maintains industrial machinery including exhaust, drying and painting, and dust collection equipment. The company additionally sells building materials and rents equipment. Incorporated in 1957, it is headquartered in Koto, Japan.