A liquid crystal phase shifter, a method for producing the same and a method for shifting phase of electromagnetic wave are provided. The liquid crystal phase shifter includes: a first base substrate and a second base substrate opposed to each other; a first liquid crystal modulation portion and a second liquid crystal modulation portion between the first base substrate and the second base substrate; a first electromagnetic wave transport layer between the first base substrate and the first liquid crystal modulation portion; and a second electromagnetic wave transport layer between the first base substrate and the second liquid crystal modulation portion. The first liquid crystal modulation portion is configured to modulate a phase of electromagnetic waves in a first frequency range and the second liquid crystal modulation portion is configured to modulate a phase of electromagnetic waves in a second frequency range different from the first frequency range.