A transport system comprising: a first intrabay overhead track provided while being offset from immediately above a load port in a first processing tool and alongside the load port in the first processing tool; a second intrabay overhead track provided while being offset from immediately above a load port in a second processing tool and alongside the load port in the second processing tool; an interbay overhead track (13, 14) that connects the first intrabay overhead track and the second intrabay overhead track; first storages and second storages provided below and lateral to the first intrabay overhead track and the second intrabay overhead track, respectively, and arranged in a vertical direction in a plurality of stages to store therein an article; a first delivery port and a second delivery port provided below and lateral to the first intrabay overhead track and the second intrabay overhead track, respectively; a first crane including a first runner that runs along the first intrabay overhead track, a first mast that hangs down from the first runner, and a first transferer to be guided by the first mast and be raised and lowered, the first crane being configured to transport an article between the load port in the first processing tool, the first storage, and the first delivery port; a second crane including a second runner that runs along the second intrabay overhead track, a second mast that hangs down from the second runner, and a second transferer to be guided by the second mast and be raised and lowered, the second crane being configured to transport an article between the load port in the second processing tool, the second storage, and the second delivery port; and an overhead transport vehicle including a runner that runs along the first intrabay overhead track, the second intrabay overhead track, and the interbay overhead track (13, 14), a holder that holds an article, a lifting driver that raises and lowers the holder while suspending the holder, and a lateral extender that controls the lifting driver to protrude laterally, the overhead transport vehicle being configured to transport an article between the first delivery port and the second delivery port. a first intrabay overhead track provided while being offset from immediately above a load port in a first processing tool and alongside the load port in the first processing tool; a second intrabay overhead track provided while being offset from immediately above a load port in a second processing tool and alongside the load port in the second processing tool; an interbay overhead track (13, 14) that connects the first intrabay overhead track and the second intrabay overhead track; first storages and second storages provided below and lateral to the first intrabay overhead track and the second intrabay overhead track, respectively, and arranged in a vertical direction in a plurality of stages to store therein an article; a first delivery port and a second delivery port provided below and lateral to the first intrabay overhead track and the second intrabay overhead track, respectively; a first crane including a first runner that runs along the first intrabay overhead track, a first mast that hangs down from the first runner, and a first transferer to be guided by the first mast and be raised and lowered, the first crane being configured to transport an article between the load port in the first processing tool, the first storage, and the first delivery port; a second crane including a second runner that runs along the second intrabay overhead track, a second mast that hangs down from the second runner, and a second transferer to be guided by the second mast and be raised and lowered, the second crane being configured to transport an article between the load port in the second processing tool, the second storage, and the second delivery port; and an overhead transport vehicle including a runner that runs along the first intrabay overhead track, the second intrabay overhead track, and the interbay overhead track (13, 14), a holder that holds an article, a lifting driver that raises and lowers the holder while suspending the holder, and a lateral extender that controls the lifting driver to protrude laterally, the overhead transport vehicle being configured to transport an article between the first delivery port and the second delivery port.