The present invention provides a prober and a transfer unit being capable of improving throughput at each of the measurement units. The prober includes a transfer object housing that houses a plurality of transfer objects, the plurality of measurement units, the transfer unit that moves between the transfer object housing for housing the plurality of transfer objects and the plurality of measurement units to transfer the transfer objects into the transfer object housing or each of the measurement units, and a moving device. The transfer unit includes environment controller configured to control an environment in a casing, and air curtain formation means for causing the casing to be in a sealed or a substantially sealed state.