107 JURNAL DARMA AGUNG Volume 30, Nomor 1, April 2022; 107–117 PENGARUH KUALITAS PRODUK, PROMOSI DAN DESAIN PRODUK TERHADAP KEPUTUSAN PEMBELIAN MOTOR YAMAHA MIO PADA PT. ALFA SCORPII BILAL MEDAN Oleh: Pandapotan Na Uli Sun Siregar 1) Julhendri Sinaga 2) Dearma Sariani Sinaga 3) Universitas Darma Agung 1,3) Institut Sains dan Teknologi TD. Pardede 2) E-mail: pand4siregar@gmail.com 1) julhenrisinaga07@gmail.com 2) dearmasinaga2@gmail.com 3) ABSTRACT This study aims at finding the effect of product quality, promotion and product design on the purchase decision of Yamaha Mio motorcycles in PT. Alfa Scorpii Bilal Medan. The research population is 200 Yamaha Mio motorcycle buyers in 2020 at PT Alfa Scorpio Bilal Medan in which samples were taken using the Slovin Formula. The results of the t-test for the Product Quality variable (X1) have a positive and significant effect on Purchase Decision (Y), The Promotion variabel (X2) has a positive and significant effect on the Purchase Decision (Y) and the Product Design variabel (X3) has a positive and significant effect on the Purchase Decision (Y). The results of the overall F test variable Product Quality (X1) Promotion (X2) and Product Design (X3) on the Yamaha Mio Motorcycle Purchase Decision variable (Y) have a significant effect. The Coefficient of Determination Test results obtained Adjusted R Square = 0.835 or 83,5% influenced by all research variables. Keywords: Product Quality, Promotion, Design and Purchase Decision Yamaha Mio. ABSTRAK Studi ini bertujuan untuk meneliti pengaruh kualitas produk, promosi dan desain produk terhadap keputusan pembelian Motor Yamaha Mio pada PT. Alfa Scorpii Bilal Medan. Populasi penelitian adalah 200 pembeli motor Yamaha Mio pada tahun 2020 di PT Alfa Scorpii Bilal Medan. Sampel diambil dengan menggunakan Rumus Slovin. Hasil Uji t untuk variabel Kualitas Produk (X1) berpengaruh positif dan signifikan terhadap Keputusan Pembelian (Y), variabel Promosi (X2) berpengaruh positif dan signifikan terhadap Keputusan Pembelian (Y) dan variabel Desain Produk (X3) berpengaruh positif dan signifikan terhadap Keputusan Pembelian (Y). Hasil Uji F secara keseluruhan variabel Kualitas Produk (X1), Promosi (X2) dan Desain Produk (X3) terhadap variabel Keputusan Pembelian motor Yamaha Mio (Y) berpengaruh signifikan. Hasil Uji Koefisien Determinasi diperoleh Adjusted R Square = 0.835 atau 83,5% dipengaruh dari keseluruhan variabel penelitian.