A chip for blood plasma separation includes: (i) a body part, in which a sealed space through which blood can flow is integrally formed and the channel part and a ridge are alternately and continuously formed； (ii) an inflow part, which is disposed at an upper region of the body part into which the blood inflows； (iii) an outlet for discharging blood cells located at one side surface of the body part； and (iv) an outlet for discharging blood plasma located at the other side surface of the body part, in which the ridge is formed discretely, a chip array for blood plasma separation including the chip for blood plasma separation, a device for blood plasma separation including the chip for blood plasma separation and/or the chip array for blood plasma separation, and a method for blood plasma separation using the device.
