Egg prices also stayed at record levels.
The national average price for a 10-egg pack was 309 yen, matching the previous highs recorded in March and May.
The ministry linked the elevated price to chicken culls carried out in response to bird flu outbreaks.
To help stabilise egg supplies, the ministry announced a package of measures aimed at reducing the impact of future outbreaks.
The steps include encouraging chicken management methods designed to minimise culling and setting up a public-private study group to examine ways of identifying infected chickens at an earlier stage.
The monthly survey covers 470 stores across Japan to calculate average retail prices.
The latest survey was carried out from 8 to 10 June.
[Copyright The Jiji Press, Ltd.]
