To provide a cost-saving adjusting mechanism for a distance between two units, which is simple in structure, comprises a few parts, and allows a user to simply adjust them at a predetermined distance, and an ultrasonic diagnostic equipment with using it.

The adjusting mechanism is characterized in that it comprises a first cylindrical body connected with a first unit, a second cylindrical body connected with a second unit to be outwardly or inwardly inserted to the first cylindrical body, a slant guiding part provided on the first cylindrical body to be tilted against a central axis of the first cylindrical body at a predetermined angle, a plurality of supporting members engaged with the slant guiding part to be a base point of a rotary movement in the central axial direction of the first cylindrical body, and a plurality of fitting holes to fit the supporting members to the second cylindrical body.