Acoustic wave filter, multiplexer, and communication apparatus

An acoustic wave filter comprising:

• a piezoelectric substrate,
• a filter body on the piezoelectric substrate which comprises a serial arm including a plurality of serial resonators connected in series to each other and one or more parallel resonators in a state where they are connected in a ladder shape, and
• a shield conductor connected to a reference potential part, wherein
• a difference of resonance frequencies among the plurality of serial resonators is smaller than a half of a difference between the resonance frequency and an antiresonance frequency of each serial resonator,
• the serial arm comprises
• a first divided arm which extends from one side toward the other side in a predetermined direction relative to the piezoelectric substrate and includes at least one of the serial resonators and
• a second divided arm which is folded back from a portion on the other side of the first divided arm and extends toward the one side and includes at least one of the serial resonators, and
• the shield conductor comprises a portion which is located between at least one of the serial resonators included in the first divided arm and at least one of the serial resonators included in the second divided arm.