To provide a support erecting concrete block which is for use in setting supports of a road sign, a curved mirror, a guard fence, etc., and achieves energy saving at the time of construction, shortening of a construction period, and reduction of construction costs.

The concrete block 100 is driven and embedded in a hole bored in the ground in order to set the supports of the road sign, the curved mirror, the guard fence, etc. The concrete block has: a block body 10 formed of precast concrete; at least two or more anchor bolts 30 each protruded from an upper surface of the block body 10 to be inserted into a base plate 20 arranged at a lower edge of the support as a different member; a top plate 60 allowing insertion of the anchor bolts 30 therein, and supporting the support; a tilt adjusting protrusion 40 arranged at a location corresponding to a substantial center of the base plates 20 and having a protruded dimension lower than that of the anchor bolts 30; and a plate frame 50 arranged at least on an upper edge of the block body 10, and enclosing the anchor bolts 30 and the tilt adjusting protrusion 40.