To synthesize a tubular structure of aluminum silicate with the tube length controlled.

The tubular structure of the alumino silicate is obtained by mixing an inorganic silicon compound solution with an inorganic aluminum compound solution, adding an alkali to prepare a precursor, adjusting the solution containing the precursor to contain a quantity of anion corresponding to a desired tube length in the solution containing the precursor based on a previously determined correspondent relation between the tube length of the tubular structure and the quantity of a prescribed anion which is a factor of fixing the tube length, and heating the adjusted solution.