Provided are SiO2-Al2O3-based or Li2O-Al2O3-SiO2-based crystallized glass that solves the cause of cracking and fracture in forming it into large-size shaped articles, that has homogeneous inner quality and that may be produced stably at high efficiency; and a method for producing it. The crystallized glass contains components of SiO2 and Al2O3, wherein the crystal precipitation peak temperature width obtained in differential thermal analysis of amorphous glass, a precursor thereof, is at least 22 DEG C. Preferably, the total amount of the TiO2 component and the ZrO2 component in the crystallized glass is within a range of from 3.0 to less than 4.3%, thereby, the expected crystallized glass can be obtained.