Provided are a device and a method for estimating a position using a downlink access point enabling efficient indoor position measurement at a relatively low cost. The device for estimating a position using a downlink access point includes: a plurality of downlink access points 100 installed at specific positions; and one or more user terminal 200 displaying its current position, wherein the plurality of downlink access points 100 wirelessly transmit different address codes, and the user terminal 200 estimates a position corresponding to the received address code to be its current position in the case in which it is within a wireless transmission range of the downlink access point 100.