Disclosed is a low-loss and flexible curved or orthogonal transmission line-integrated multi-port antenna for an mmWave band. The low-loss and flexible curved transmission line-integrated multi-port antenna includes a multi-port antenna portion which includes a plurality of single antennas and forms multi-ports and a transmission line portion which includes a plurality of transmission lines which correspond to the single antennas, respectively, are integrated with electricity feeding portions of the single antennas to which central conductors used as signal lines of the transmission lines correspond, and has a curved shape. Here, the single antennas each include a ground plate, a dielectric substrate, formed on the ground plate, a signal conversion portion formed on the dielectric substrate, and an electricity feeding portion formed on the dielectric substrate and connected to the signal conversion portion.