A probe unit includes a probe pin and a support unit supporting the probe pin. The support unit includes first and second arms disposed at a distance along a direction in which the probe pin probes a probed object; a holding unit holding base ends of the arms; and a linking unit attached to the probe pin and linking front ends of the arms. The support unit constructs a four-bar linkage that permits linear or approximately linear movement of the probe pin in an opposite direction to the probing direction. The first and second arms have through-holes at positions slightly closer to the front ends than the base ends and positions slightly closer to the base ends than the front ends, center parts between the through-holes function as bars in the four-bar linkage, and formation positions of the through-holes function as joints in the four-bar linkage.