Born in San Sebastián, Gipuzkoa, Idiakez finished his development with Real Sociedad, making his senior debut with the reserves and also playing alongside his younger brother Iñigo.

[5] On 10 October 2001, while Ciudad were in the third division, they faced La Liga club Sevilla in the first round of the Copa del Rey.

[6] Idiakez returned to Real Sociedad B after retiring, being appointed manager in the summer of 2008,[7] relegated from the third division in his first season but winning promotion in the second.

[14] After taking Lleida Esportiu to the promotion play-offs in the same level in 2016, he moved abroad for the first time in his entire career, signing for two years at AEK Larnaca in the Cypriot First Division.

[15] Back to Spain, Idiakez was appointed manager of second division club Real Zaragoza on 18 June 2018,[16] being sacked on 21 October.