Odakyu Electric Railway Co., Ltd. (小田急電鉄株式会社 Odakyū Dentetsu Kabushiki-gaisha), or OER, is a major railway company based in Tokyo, Japan, best known for its Romancecar series of limited express trains from Tokyo to Odawara, Enoshima, Tama New Town, and Hakone. OER forms the core of the Odakyu Group, which comprises 101 companies (as of July 14, 2017) and includes the Enoshima Electric Railway, Hakone Tozan Railway, Odakyu Bus, Odakyu Department Store, and Hyatt Regency Tokyo Hotel.