A machining support device for supporting improvement of a machining result of a numerical controller includes: a machining resource information acquisition unit that acquires functions set in advance in the numerical controller as machining resource information; a machining content information acquisition unit that acquires a machining content to be executed by the numerical controller as machining content information; a machining result calculation unit that calculates an expected machining result expected to be obtained when the machining content included in the machining content information is performed on the basis of the machining resource information; a retrieving unit that retrieves software that improves the calculated expected machining resu and an informing unit that informs of the retrieved software.
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