A wristwatch with a super hard wristwatch case comprising: a case body of sintered carbide and ceramics having left/right pairs of leg portions (11 a, 11 b, 12a, 12b) or left/right pairs of portions corresponding in shape to said leg portions (11 a, 11 b, 12a, 12b) that are provided at opposite positions of said case body; a back cover which is fixed to a back of said case body; a wristwatch band formed separately from said case body and said back cover; spring rods for supporting said wristwatch band between said leg portions (11 a, 11 b, 12a, 12b); and installation spaces between said leg portions (11a, 11b, 12a, 12b) of said case body for supporting one end of wristwatch band, characterised in that said back cover is formed of shock-resistant metal and has left/right pairs of projection pieces (20a, 20b, 21 a, 21 b) integrally formed with the back cover, said projection pieces (20a, 20b, 21 a, 21 b) protruding from said back cover in a direction perpendicular to the surface of said back cover so as to be opposed to inner wall faces of said leg portions (11 a, 11 b, 12a, 12b) of said case body, said projection pieces (20a, 20b, 21 a, 21 b) being formed with fixing holes (22a, 22b, 23a, 23b) for said spring rods in regions thereof which are adjacent tips of said projection pieces (20a, 20b, 21 a, 21 b), and said projection pieces (20a, 20b, 21 a, 21 b) of said back cover are fitted and fixed in said inner wall faces of said leg portions (11 a, 11 b, 12a, 12b) and said wristwatch band is fixed by spring rods being bridged and engaged between said fixing holes (22a, 22b, 23a, 23b) of said projection pieces (20a, 20b, 21a, 21 b) without the need to provide further fixing holes for the spring rod in said leg portions (11a, 11b, 12a, 12b) to fix the spring rods. a case body of sintered carbide and ceramics having left/right pairs of leg portions (11 a, 11 b, 12a, 12b) or left/right pairs of portions corresponding in shape to said leg portions (11 a, 11 b, 12a, 12b) that are provided at opposite positions of said case body; a back cover which is fixed to a back of said case body; a wristwatch band formed separately from said case body and said back cover; spring rods for supporting said wristwatch band between said leg portions (11 a, 11 b, 12a, 12b); and installation spaces between said leg portions (11a, 11b, 12a, 12b) of said case body for supporting one end of wristwatch band, characterised in that said back cover is formed of shock-resistant metal and has left/right pairs of projection pieces (20a, 20b, 21 a, 21 b) integrally formed with the back cover, said projection pieces (20a, 20b, 21 a, 21 b) protruding from said back cover in a direction perpendicular to the surface of said back cover so as to be opposed to inner wall faces of said leg portions (11 a, 11 b, 12a, 12b) of said case body, said projection pieces (20a, 20b, 21 a, 21 b) being formed with fixing holes (22a, 22b, 23a, 23b) for said spring rods in regions thereof which are adjacent tips of said projection pieces (20a, 20b, 21 a, 21 b), and said projection pieces (20a, 20b, 21 a, 21 b) of said back cover are fitted and fixed in said inner wall faces of said leg portions (11 a, 11 b, 12a, 12b) and said wristwatch band is fixed by spring rods being bridged and engaged between said fixing holes (22a, 22b, 23a, 23b) of said projection pieces (20a, 20b, 21a, 21 b) without the need to provide further fixing holes for the spring rod in said leg portions (11a, 11b, 12a, 12b) to fix the spring rods.