A touch signal probe comprises a probe casing fixed to a shank body through a shank anchor, the probe casing containing a stylus shaft held for inclining relative to the probe casing, a fixed contact on the inner bottom of the probe casing, a contact receiving portion carrying a movable contact which is fixed to the stylus shaft and defines a set of contacts together with the fixed contact, and a spring operably located between the shank anchor and the contact receiving portion to urge the movable contact toward the fixed contact, whereby the displacement of the stylus shaft can be detected on the separation of the contacts. The touch signal probe is characterised in that the shank anchor slidably receives a spring seat having an engagement face engaged by the spring at one end and in that an adjusting screw for forwardly and rearwardly moving the spring seat is threadedly screwed into the shank anchor, the tip of the adjusting screw engaging the opposite face of the spring seat, whereby the spring can be constricted or expanded to adjust a pressure of contact between the fixed and movable contacts by moving the adjusting screw in either of the opposite directions.