PROBLEM TO BE SOLVED: To provide a method for continuously manufacturing a dispersion liquid containing a pest control ingredient.SOLUTION: The solid pest control ingredient is suspended in a water immiscible organic solvent, and a dispersion medium is made of either a water solution of alcohol or plain water. The suspension and medium are supplied into a first dispersion tank wherein the suspension and the medium are stirred. This method is characterized by including two processes: one for dispersing the suspension to the medium and the other for supplying a first dispersion liquid discharged continuously from the first dispersion tank into a second dispersion tank wherein the first dispersion liquid is stirred until a dispersion state becomes steady.COPYRIGHT: (C)2012,JPO&INPIT【課題】有害生物防除成分を含有する分散液を連続的に製造する方法を提供する。【解決手段】水非混和性の有機溶媒に固体の有害生物防除成分を懸濁させた懸濁液と、アルコールを含む水溶液又は水からなる分散媒とを、一次分散槽内に連続的に供給しながら、前記懸濁液と前記分散媒とを一次分散槽内で撹拌することにより、前記懸濁液を前記分散媒中に分散させる工程と、一次分散槽から連続的に排出される一次分散液を、二次分散槽に連続的に供給しながら、分散状態が定常になるまで二次分散槽内で撹拌する工程とを含むことを特徴とする。【選択図】図6