To provide a plant growth inducing device with high practicability enabling easily, securely, laborsavingly and smoothly performing growth inducing work of plant stems with a simple and low-cost structure.

This plant growth inducing device 10 includes a plurality of seizing means 12 receiving a longitudinal midway part K1 of a plant stem K and seizing in a loading state so as to induce at least in the horizontal direction in a working surface S where the growing plant stem is induced, managed and harvested, and the growing plant stem K expands in a planar state in a necessary distribution and is fixedly set. It is possible to securely induce the growth direction of the plant stem in an objective direction while seizing the longitudinal midway part of the plant stem growing with easy work in a loading state with the seizing means, and to improve the workability of management and harvest.