To solve the problem in a method for employing a single pipe as a simple way for a mechanism used in a chemical sprayer, or the like, for diluting/mixing a fluid B with a fluid A, introduce the fluid A for dilution from one end of the pipe, and the fluid B for dilution from small holes formed in an intermediate part of the pipe, and to join and discharge the fluids from the other end, thereby makes it hard to uniform the small holes for introducing the fluid B to be diluted because their diameters are very small.

The subject liquid diluting/mixing/feeding apparatus employs a single pipe. The fluid B to be diluted is introduced into one end of the pipe. The pipe is provided with an inner diameter and a length sufficient to enable an easy setting of a uniform flow rate. A side hole having a large diameter comparatively easy to prepare is formed in a part of the pipe nearer to the other end side. The fluid A for dilution is introduced through the side hole and joined. The joined fluid is discharged from the other end.