Provided are a concentrated fermented milk and a production method therefor, in particular, a concentrated fermented milk having an increased viscosity and a production method therefor. Also provided are a two-layer-type fermented dairy product and a production method therefor. A production method for fermented milk which includes: cooling fermented milk after concentrating； and storing the fermented milk at a predetermined temperature for a predetermined period of time to increase a viscosity of the fermented milk. A production method for a two-layer-type fermented dairy product, which includes a layer of a sauce containing fruit pulp and/or fruit juice on fermented milk and is contained in a container, which includes: supplying the fermented milk into the container at a supplying temperature of 15° C. or less； and supplying the sauce on the fermented milk after the supplying of the fermented milk.
