The present invention allows for an efficient communication between a terminal apparatus and a base station apparatus. The terminal apparatus generates and transmits a reference signal associated with a transmission of a Narrow Band Physical Uplink Shared Channel (NPUSCH) in a subframe. A plurality of first subcarriers include a plurality of second subcarriers and a plurality of third subcarriers, and a plurality of fourth subcarriers include a plurality of fifth subcarriers and a plurality of sixth subcarriers. In a case that the NPUSCH is mapped to the plurality of second subcarriers or the plurality of third subcarriers, the reference signal is mapped to the plurality of first subcarriers, and in a case that the NPUSCH is mapped to the plurality of fifth subcarriers or the plurality of sixth subcarriers, the reference signal is mapped to the plurality of fourth subcarriers.