PURPOSE: To increase the detection precision, by connecting right/left paired conveyance chains to each other by a continuous-connection member, and providing support bases for supporting fruit-receivers or the like on the right/left side portions of the continuous-connection member.

CONSTITUTION: L-shaped outer plates 11, 11 are provided to paired right/left conveyance chains 1, 1, respectively, and a connection member 2 is disposed, at its opposite ends, on right/left opposing bent portions thereof to be bridged therebetween and mounted by being fastened by, for example, a bolt/nut fastener, thereby connecting the paired right/left chains 1, 1 together. And support bases 4, 4 are removably mounted on the bent portions of the continuous- connection member 2, respectively. On these support bases, hollow cushion members 12 are disposed, respectively, at a substantially central parts thereof in a state wherein they are continuously connected to the support bases 4. In addition, fruit receivers 3 are provided turnably by support arms 13. This construction prevents twisting of the conveyance chains 1, 1 and also prevents erroneous detection.