The present invention is aimed to provide, as an acoustic lens propagating a sonic wave having a wavelength λ of 100 μm or less, an acoustic lens capable of exhibiting excellent acoustic characteristics in response to the wavelength λ of the sonic wave to be propagated and a production method thereof. The acoustic lens is an acoustic lens 1 to be used for propagating a sonic wave having a wavelength λ of 100 μm or less, wherein the acoustic lens contains a silicone resin and silica particles, an average primary particle diameter of the silica particles is 15 nm or more, and a particle diameter (D90) of 90% of a cumulative percentage in cumulative particle size distribution of the silica particles is less than ⅛ of the wavelength λ of the sonic wave to be propagated.