Problem to be solved: To provide a technique for producing a boiled egg in which an unsolidified portion is left in an egg. The method for producing the half-ripe egg includes a step (203) of producing the half-ripe egg by performing a first heat treatment of raw egg at 90 degrees Centigrade 100 in a treatment tank, and a step (204) of immersing the half-ripe boiled egg in a low-temperature seasoning liquid within 10 minutes from the start of the first heat treatment and cooling the half-ripe egg under pressure. The present invention also provides a method for producing the same, which comprises a non-solidified portion having fluidity, containing 2075 percent in the area ratio of yellow, A half-ripe boiled egg is provided. Selected drawing: Figure 2

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