[Problem] To provide a membrane treatment method and a membrane treatment apparatus using a membrane module, which are capable of reducing fouling using a simple installation, without increasing costs.[Means for Solving the Problem] The membrane treatment method and membrane treatment apparatus using a membrane module according to the invention, having a membrane treatment tank 2 and a membrane module 1 centrally provided in the tank 2 for continuously performing filtration while raw water is being passed thereto; wherein raw water is introduced from the outside of the membrane treatment tank 2 toward the inside thereof along a direction tangent to a perimeter of the tank, to create a swirling flow in the tank 2.