EXTERIOR PART FOR TIMEPIECE AND TIMEPIECE

To provide an exterior part for a timepiece which is made of shiny metal and thus is brighter and causes metal allergies less easily.SOLUTION: An external case (an example of an exterior part for a timepiece) includes: a metal base material; and a multilayer reflection layer covered with at least a part of the base material. The multilayer reflection layer has a structure in which a first inorganic material layer with a first index of refraction and a second inorganic material layer with a second index of refraction are alternately deposited, the first index of refraction being smaller than the second index of refraction. The first inorganic material layer includes at least one selected from the group of silicon oxide, aluminum oxide, oxynitride aluminum, and magnesium oxide. The second inorganic layer includes at least one selected from the group of silicon nitride, zirconium oxide, boron nitride, titanium oxide, hafnium oxide, tantalum oxide, yttrium oxide, and niobium oxide. The first and second inorganic material layers do not include Ni, Cr, Co, Zn, Hg, Sn, Pd, Pt, Cu, Au, Cd, Mn, and Sb.SELECTED DRAWING: Figure 2 【課題】金属光沢に優れ、明るさが向上し、かつ金属アレルギーを起こしにくい時計用外装部品を提供すること。【解決手段】外装ケース（時計用外装部品の一例）は、金属製の基材と、基材の表面の少なくとも一部に被覆された多層反射層と、を有し、多層反射層は、第１屈折率を有する第１無機材料層と、第１屈折率より高い第２屈折率を有する第２無機材料層とが交互に積層された構造を有し、第１無機材料層は、酸化ケイ素、酸化アルミニウム、酸窒化アルミニウム及び酸化マグネシウムからなる群から選択される少なくとも１種を含み、第２無機材料層は、窒化ケイ素、酸化ジルコニウム、窒化ホウ素、酸化チタン、酸化ハフニウム、酸化タンタル、酸化イットリウム、及び酸化ニオブからなる群から選択される少なくとも１種を含み、第１無機材料層及び第２無機材料層は、Ｎｉ、Ｃｒ、Ｃｏ、Ｚｎ、Ｈｇ、Ｓｎ、Ｐｄ、Ｐｔ、Ｃｕ、Ａｕ、Ｃｄ、Ｍｎ、及びＳｂを含まない。【選択図】図２